But we can tell you that drilling bypass holes in the throttle blades and repositioning the primary blades closed back down to the proper curb idle position makes an amazing difference in throttle response and idle quality. Keep backing off the screw until it is no longer contacting the throttle linkage. The a/f jumps from 12.5 at idle to 15+. The 1406, which was working good on the 440 in my Imp had a tremendous off idle stumble when I put it on the fresh 383 in the vert and it got the 1411's .035 nozzles so I put the orange springs from the 1411 in it and it no longer stumbles either. Under no circumstances should a stock engine be out more than 1 1/2 turns unless the engine is completely worn out, and burning more oil than fuel. Discussion Starter • #1 • May 16, 2008. Had a head gasket fail a couple of years ago and drownded it with coolant. Aftermarket air filter. Proper adjustment is critical for a good idle. When a carburetor is running lean, the fuel-to-air ratio is off because the carburetor is delivering too much air. Required fields are marked *. Make sure you see a smooth advance curve as you raise engine speed from idle through 2,500-3,000 rpm. Shut off the engine. Here’s how I repair carb caps: https://www.randakksblog.com/gl1000-cv-slide-cap-variations/, on a 77 gl1000 carb in the area of the float there is an aluminum disc appr. Then, back off on your idle set screw to lower your idle while continuing to spray into the carburetor. This is a good idea to increase torque especially given the cam timing. Main circuit. To enrich the idle mixture, one must first measure the inside diameter of the idle tubes. In fact, GL1000 carburetion is easy to sort compared to some of the demonic setups I’ve encountered (my Weber-equipped Ducati 750 Nuevo Sport wins the prize as the worst I’ve ever personally grappled with). If the throttle is eased into the off-idle position and the motor stumbles, the idle circuits and the transfer slots are probably too lean. The criticism has been repeated so often by so many that it has become accepted as fact. Getting the idle correct within the guidelines of the Weber recommendation may mean you need to change the primary idle jet to provide a strong enough mixture at 1-1|2 to 2 turns of the idle MIXTURE screw. Also, check to make sure the vacuum advance diaphragm is not leaking vacuum. The idle mixture control screws in these carburetors are the pre-smog short taper. I could have bought a much newer replacement and scrapped this one for what I spent. I also rebuilt the original 2100 that was in the trunk and installed it and that didn't solve it. https://www.carburetor-parts.com is providing this video about how the off-idle works on the Rochester B, 1 barrel carburetor and a possible hesitation. The ideal solution is to couple this engine with a looser torque converter to reduce the load. To me it sounds like the transition circuit (T-slot) is getting more air than it should for correct calibration. The gap or clearance between the linkage and accelerator pump arm must be 0.012 – 0.015. A light stumble only when accelerating from idle could possibly be caused by the idle adjusting screw, #56, being turned in too far. You might consider this item: Randakk’s GL1000 Carb Rebuild Video. His method preserves the overall orifice length quite easily. Most dealer personnel don’t have the aptitude or patience required to do a proper job. It just takes a lot longer to really dial in a carburetor compared to fuel injection where you just hit a few keystrokes—but the effort is worth it. If your car or truck is equipped with a Holley four barrel carburetor and stumbles upon acceleration, more than likely the carburetor needs an adjustment to the accelerator pump assembly. Sorry. The jets (and rods in Carter/Edelbrock) carbs control the A/F ratio from off-idle to wide open throttle. If I'm going uphill and the bike is pulling, it is fine but when I'm going down hill and give it just a little throttle to help it along, it stumbles. By doing this, you are taking away air and your car should stall, or at least idle down very low to 600 RPM or lower. Weak battery / charging system. Set the idle mixture control screws first. Idle mixture screws are out 1-1/4 turns, secondary stop screw has 1/4 turn (any further open I have high idle bs). 2. And, you probably you don’t even need a new carburetor. But when i drive, its like it goes on 2-3 cylinders, full trottle in 1 gear, no power. 1) The motor is picking up a tremendous lot better from idle , (I am not afraid anymore of hairpin corners in the mountains) This makes them require excess choking (which wouldn’t be so bad if the fast idle ramp was curved better). with Jeff Smith: Before Buying a New Carb to Fix Engine Stumble, Try This. This is the stock carb from my mercruiser 3.7. Allow me a little soapbox time. I am enjoying all of the helpful little hints and tricks shown here. ... all causing endless problems with stumbles and pass-outs on acceleration. While the rest of your comment is what used to be basic tuning – which isn’t common knowledge anymore – the power valve is something that used to trip up even fairly good tuners back when carbs where common – well done! This is an involved process that is too long to discuss here. My carburateurs have the number 755B (idle airjet 110, motor GL2) and after a lot of work, on them the last step was to modify the air intake jet to get a better performance just above idle. Not big miles on it – just passed 70,000. A carburetor uses intake vacuum to supply fuel to the engine. 2. Of course, this is not an ideal situation. I think it … Then, back off on your idle set screw to lower your idle while continuing to spray into the carburetor. 63 jet primary and 66 sec., 10.5 pv. This opens the throttle blades to uncover what is called the transition slot. But it clears up if I just give it a touch more throttle. I modified a spare set of 60 jets, by boring them langer with a microdrill to 0,95 mm and replaced the 110 airjets, Now I am experiences the next positive changes is behavoir: Now evaluate that change. I did install the Randakks kits and was maticulous about details and plenty of time spent. As mentioned previously, Robert Overby wrote a very interesting article titled “Improving Your GL1000’s Performance” which appeared in Wing World in the June 1995 issue. That is the so-called “puck.” It’s an access port to allow cleaning and to cover an access area necessay for manufacturing the carbs. We often see where the adjustable spring is set incorrectly. Often, a poor idle condition will not be the carburetor’s fault, but a clogged Positive Crankcase Ventilation (PCV) system. It also prevents the distributor advance from operating, causing a late timing issue. (Image/Holley). A richer idle mixture may be required in order for the engine to idle against a tight converter. 70 Maverick Grabber, 5.0 (Perf. But, I have a 79 GL1000 that I have had since new. Hesitation or Stalling During Acceleration If the engine either hesitates or stalls upon acceleration due to the carburetor, the carburetor's accelerator pump nozzle may need to be cleaned or the secondary throttle plates may not be … Robert recommends a replacement jet – size #98. But it clears up if I just give it a touch more throttle. I read endlessly about CV carb coughs. There is also a stumble going from idle to just off idle (about 12-14 on the TPS). — J.P. Jeff Smith: J.P., we can definitely help you. Answer here: https://www.randakksblog.com/floats-101/, and here: https://www.randakks.com/randakks-honda-gl1000-carb-rebuild-video.html, Thanks Randakk for sharing your knowledge, this were great lessons, I am living in Europe and own 2 GL1000 K3. To cure this condition, either slightly undo all four idle-mixture adjusting screws to enrich the system or enlarge the idle-feed restrictors in the metering blocks. CARB #62989 Finally had some time with the car over the weekend. Ãîðèò a0 1975-1977 GL1000s are blessed with a Superbike-class engine. When in a cornering car, however, the fuel will move to the outside of the bowl. Well, thought it may have been just the old engine. I think it's similar to the v6 carb. 1970 440 stock manifold with edelbrock performer 1407 carb stock exhaust manifolds Comp Cam -4 hydraulic flat tappet I've tried enriching the fuel mixture but it doesn't help. I’m surprised he forgot to mention the power valve. Note: This mod is for ’75-’77 GL1000s…not required or necessary for later bikes. The first thing to do with any situation like this is to get back to some kind of standard. Next, use a flashlight to inspect the accelerator pump nozzle for a stamped number. The forces which require the bike to not topple are the same as those which keep the fuel level relative to the carb bowl. Most GL1000 needles dance a bit at idle. Im about to say hell with it and spend the cash on a new carb if I cant figure out this carb soon. These are from the same jet “family” and can be drilled out with a size #62 micro drill per above. The small holes in the venturi can be blocked with ethanol residue. It gets about 10 mpg set up like this. I am totaly stuck right now, please help me ! 1 and ½ turns from lightly seated, and the valves are WIDE OPEN. If your carbs are clean (I mean REALLY), all your vacuum hoses are good, your air-cut off valve fresh, choke linkage free, butterfly pivots not worn out, floats set and operating correctly, vacuum pistons free, air and fuel filters fresh and you’ve synchronized AFTER all other tune-up issues are perfect, you should have excellent results. The only thing what did not change, is a hik up when you give a bit more gas at once. Set ignition timing. The a/f jumps from 12.5 at idle to 15+. Otherwise, you will need a micrometer that is sized in the metric convention. You probably have a minor ignition and/or carb issue issue responsible for that symptom. All rights reserved. As most have been saying; there is an off-idle stumble that's much worse when the car is cold. You will need to remove the carburetor from the bike or at least get it into a position where you can tilt it and get the float bowl off. It’s definitely worth the effort to make this happen. Retains stock bore and stroke. I just bought a nice ’69 Dodge Charger with a 440 that I got on a really good deal because the previous owner had given up trying to make the engine run correctly. if i apply moderate throttle it doesnt do it. Set the fast idle screw to allow the engine to warm to normal operating temperature. Another lean idle situation that can occur is a slight off-idle hesitation. If you ride extensively at high altitude (above 6000 feet) I would forego this “off-idle” mod. If they are way off, that’s good. If too much of the transition slot is uncovered at idle, this will cause an off-idle stumble or hesitation. it stumbles then picks up the load. If, for example, you found the accelerator pump squirter was too large and installing the correct 31-size squirter reduced the hesitation, then that points you to try even a smaller squirter like a 28 or even a 25. No air jet “glitch” fix is needed on ’78-’79 models. Engine is a Chevy 350, Vortec heads, 220 duration … where can I find a chart /spreadsheet that show those items, jets/ squiters/ etc as listed in th e article, for all other holley 600/650/750 etc single an double pumpers. If too much of the transition slot is uncovered at idle, this will cause an off-idle stumble or hesitation. Getting the idle correct within the guidelines of the Weber recommendation may mean you need to change the primary idle jet to provide a strong enough mixture at 1-1|2 to 2 turns of the idle MIXTURE screw. Go up one on the main jet. The idle mixture screws control the amount of fuel going through the metering blocks and the idle feed restrictors and idle air bleeds control the air fuel ratio and the pump shot has to be in the right range with all those areas so when you go from idle to off idle and progress into each circuit of the carb so there is not any hesitation or bogs. My Gold Wing is a 1976 model. Generally, this means you must not only clean the slides and bores but also CAREFULLY polish with crocus cloth (don’t damage the locating bore pins!). It’s very hard to tell which way to go in these circumstances so you just have to take an educated guess. If backing it out as much as 1/4 turn doesn't cure it the problem is in the accelerator pump circuit. The dashpot is an emissions-reducing device that it important for smog control. So, while the rest of your argument may be correct, I think this part has a problem. Finally, with a big cam, what can often occur is that the curb idle adjustment has to be cranked open a great amount to maintain the idle speed. No idea what is happening then. Sure would like some advice on this. ×òî îçíà÷àåò êîä íà ëåä 40 â ìàíóàëå íå íàøåë. Personally, I make a conscious effort not to spend much time below 3,000 RPMs. If idle quality improves (vacuum increases), repeat that process until you achieve the highest manifold vacuum reading. Engine is fairly fresh, about 5000 miles since rebuild. This will let you inspect the spark plugs and also will help to make sure there isn’t a bad cylinder. Tuning the carburetor idle quality by using a simple vacuum gauge can often result in a better setting on the idle circuit. Easy, but costs about $25: Secure 4 replacement jets from SUDCO with Keihin Part #99101-124-100 (SUDCO part # is 99101-ZF5-1000). If not, then you have a blockage somewhere. By the way, I live at about 350 feet above sea level. It’s unreasonable to expect a peaky engine, with a semi-radical cam to have a perfect idle. One other concern I am surprised that hasnt been brought up is the plastic caps on the air needle valve caps. Small adjustments (only a quarter of a turn) can make a big difference. However, my view is that this is an unnecessary “improvement.” I’m convinced that if anyone bothered to do a dyno test, the stock set-up would produce more peak power and torque with flatter curves. © Copyright 2016 Randakks Cycle Shakk. Havent been in the carb. Customer Tom Stark recently suggested this improved technique for soldering and drilling these jets. Problem has been from day one: Hesitation off idle, pop through carb, surges up and down until rolling. Set them both the same at about 1¼ turns counterclockwise from fully seated. Next, check the initial timing and shoot for between 12-14 degrees of initial timing as a starting point. I have a 355 with camel humps on it. It’s a common situation to find one side adjusted to 1½ turns out while the opposite idle mixture screw is adjusted to less than a ¼ turn. Was curious a good place to start with some off idle stumble when the car gets some heat into it. Push it in exactly 5/8″ using a drift or piece of dowel. The Honda part number for this replacement jet is 99164-601-0980. The last time i tinkered with it I tightened the "choke" enrichment cable and snapped the plastic flange, duh. While not often associated with a carburetor problem, an exhaust leak is often overlooked and can lead to off-idle hesitation and deceleration pops. Discussion in 'Dyna Models' started by Freewheelin Franklin, Mar 9, 2011. Quote Reply Topic: Motorcraft 2100 Stumble off Idle? - JIS - Set of Three #1 - #2 - #3, Lazy / Slow Return to Idle (or Erratically High Idle), General Honda GL1000 Troubleshooting Guide, Not so “Green,” No-Drop Idle Mixture Adjustment Method, https://www.randakks.com/randakks-honda-gl1000-carb-rebuild-video.html, https://www.randakksblog.com/gl1000-cv-slide-cap-variations/, http://randakks.com/collections/honda-gl1000/products/gl1000-carb-pucks-included-in-gl1000-master-kit, Jetting Advice For Vintage Honda CV Carbs | Randakk's Blog, General GL1000 Troubleshooting Guide | Randakk's Blog, Top Honda GL1000 Carb Rebuilding Mistakes | Randakk's Blog, Lazy / Slow Return to Idle | Randakk's Blog, Early vs. Late Carb Mixing and Matching | Randakk's Blog, Randakk's Approved Carb Rebuilder Program | Randakk's Blog, Early vs. Late Carb Mixing and Matching / GL1100 Carbs on GL1000? But, the penalty is longer warm-up times. The solution for ’76 carbs is to use #105 idle air jets. I believe the stock set-up on a GL1000, properly maintained and tuned delivers results as good as you can reasonably expect on a 4 cylinder, 4 carb bike of this vintage with this level of performance. Its my first experience, of such a great improvement on a GL1000 with such minor changes, I was compleetly blown away by the endresult. 2) It uses less choke to cold start Your report is not sufficient to offer a definitive assessment. In my case, it was going up to a #50, which is apparently the end of the line. A drill press would also clearly work.”, Tom Stark’s Method for Soldering / Drilling Air Jets. With the float bowl off and the carburetor in the normal upright position, connect the fuel line to the gas tank, hold the float up and turn the gas on. A good test is to stick a wooden toothpick into one of the idle air corrector jets to see if it helps with the 3,000-rpm test. New bike to me. Cleaned carbs, adjust floats, tested air screws at 1.5, 2.0, 2.5 turns out. You must check this with the vacuum advance disconnected. There are many causes such as: incorrect jets, dirty jets, float problems, exhaust blockages, vacuum leaks, sync problems, etc. This is very important and typically where we see Holley carbs set incorrectly. I’ve owned and ridden many bikes. They are mounted in the brass elbow on the carb end of the 4 short vacuum hoses coming from the carb plenum. Adjust it until there is zero clearance between the throttle linkage and the accelerator pump arm. Hi, i have troubleshooting my goldwing 1977 many many hours. Next, check the spark plug wires. The trick of using a pop-rivet shank to plug and hold the jet for soldering is perfect. Aggressive sustained cornering can become a problem with these carbs. The single carb conversion units which are available for GL1000s appear to be well engineered. I’ve cleaned many carbs that were supposedly just cleaned by someone else and found lots of grunge in obvious places. Make sure the slotted end is oriented away from the elbow. However, the preferred fix still retains the stock idle fuel jet […], […] the “off idle” fix (recommended for ’75-’77 models […], […] Failure to implement the “Off Idle Fix.” Probably the single best “improvement” you can make on an early GL1000 […], […] #110 or #115 idle air jet (external – in the brass elbow) This should be modified to fix the infamous “off idle” glitch. I’m cleaning up a 76 carb set and need clarity on the idle air jet mod.I have a micro drill that is 0.04″ in diameter. / GL1000 Carb Specs | Randakk's Blog. Additional Note dated 5/22/03: Recently, I discovered a small difference here. My calipers can also measure in mm but I ordered #59 drills to be sure. Re-attach the vacuum tube and you’re done. Hey guys, I've been having a problem with my '68 camaro. This will be our starting point. Take off carb, put on glasses and clean it like you love it. Once it hits the accelerator pump, all is fine. I had mine off and put a little water on top and blew some shop air from the bottom and had bubbles like crazy. If the choke is in the open position, the carburetor's power valve may have blown, or the idle jet within the carburetor may be clogged with dirt. Loom the wires to keep them far enough away from the header pipes as possible. Well, forget that silly notion, the jets have nothing to do with it. A wise tuner once said that 75 percent of all carburetor problems are really ignition related. Instead, here’s what you do. Lean transition circuit is more likely. We recommend NO MORE than 0.005-inch increase in the diameter. Aggressive sustained cornering can become a problem with these carbs. any suggestions? Robert recommends a replacement jet – size #98. RPM heads, RPM intake, FiTech EFI, Comp XE266HR roller cam, EDIS/Megajolt ignition, long headers), T5Z w/Steeda TriAx shifter, 9" Trac Loc w/3.89:1, 31 spline axles. if removed you will find 3 small holes . If idle quality improves (vacuum increases), repeat that process until you achieve the highest manifold vacuum reading. Study the Tech Tips for possibilities …there are literally dozens. Once you understand the design intention (superbike performance), you have to reconcile this with the inspired and semi-illogical combination with a touring geometry frame and running gear. The manufacturers range is 1/8 to 2 1/4 for THIS carburetor. Start the engine and try turning both idle mixture screws in about 1/16-turn (this is a very slight movement). It starts, idles, runs, and REVS great. Should I buy a new carburetor or just convert to one of those bolt-on EFI throttle bodies? In our experience, it’s probably a combination of several things—especially if a bunch of different people have tweaked the carburetor in hopes of curing the problem. Continue adjusting the idle mixture screws 1/2 turn at a time until the engine either stumbles or the idle speed either remains the same or decreases. run thin wire down the holes. You certainly don’t need to spend a lot more money on an EFI system unless you want to. However, there is an easy fix. Part of the issue with the GL1000 idle is the slightly “lumpy” cam that causes semi-irregular cylinder filling/firing at low speeds. Not as bad as a AA fuel dragster but very noticeable to a good ear. etc. Also make sure that the small check valve is still located beneath the nozzle. “I use a 1/8 pop rivet and grind the end flat. Sticky CV slides i also adjusted the accel pump. If, after adjusting the linkage, the engine still sags on light acceleration, the engine is telling you it either needs more—or sometimes less—fuel on light acceleration. 4. They do benefit from a special fix for the off-idle “glitch” that plagued the earlier models. I have installed the Pro Flo 3 on my '66 Chevelle. For example, a #098 jet is actually 0.98 mm. A small torch would work best, but I used a regular big propane torch, heated it up, then used very thin solder and was able to fill the hole, leaving the jet the same length as stock. If this is the case, the idle jet needs to be larger or the air corrector smaller. Remove the stock jets (you won’t be using them!). This assembly delivers an initial shot of fuel in the right amount, and duration, to provide crisp throttle response right off idle. Page 1 of 2 1 2 Next > Freewheelin Franklin Member. One can then drill these tubes oversize. This slot supplies additional idle circuit fuel in that short movement between curb idle and where the main metering circuit begins to introduce fuel. It just doesn't like seeing 11-14 on the TPS. Ãîðèò a0 I spent a lot of last summer doing a complete makeover on my old baby. By the way, I recommend you replace these vacuum hoses while you’re at it. I recommend you use micro drills that are marked with the standard sizes. If the throttle is eased into the off-idle position and the motor stumbles, the idle circuits and the transfer slots are probably too lean. If the engine seems to have an off-idle stumble, changing the size of the squirter itself can fix this issue. In ’76, Honda slightly enlarged the 3 idle by-pass ports (located under the round aluminum “puck”). With the engine off, pump the throttle while looking down the carburetor throat. It’s bigger than the orifice in the 115 jet. It starts great, idles great, has great throttle response and everything is great unless I'm just off of idle and cruising flat or down hill. Unfortunately, this can also create an off-idle flat spot. If your car or truck is equipped with a Holley four barrel carburetor and stumbles upon acceleration, more than likely the carburetor needs an adjustment to the accelerator pump assembly. Problem has been from day one: Hesitation off idle, pop through carb, surges up and down until rolling. A light stumble only when accelerating from idle could possibly be caused by the idle adjusting screw, #56, being … I can’t personally verify, but some claim single carb conversions “run out of steam” on the top end. Dave installed a size 55 idle jet to replace the size 50 that the Pierburg carburetor came with, but no change. I found some small chrome plastic caps- filled them with JB weld and got them sealed up. The right plugs seems ok. What in the carbs can do like this? For example, if you don’t remove ALL the jets and emulsion tubes, you’re wasting your time. Replace the altered jets and you’re done. Right now my carb is set accordingly. The engine is a 440 with headers, an Edelbrock Victor, Jr. intake, and some kind of cam. AFR varies from 15.0-9.8 while this is happening. If the engine seems to take a deep breath and then accelerate quickly (almost like the iginition cuts off for a split second), it’s generally a lean stumble. If it is, it can cause all sorts of problems. ’75 and ’77 models use stock Keihin Pilot Air Jets – size #110. Keep backing off the screw until it is no longer contacting the throttle linkage. It sems ok in neutral and when i rev up the engine. If not, then you have a blockage somewhere. This hose is smaller…3.5 mm id (good substitute is 5/32″ id). The bad news is that these replacement jets were discontinued by Honda in 1996! Going to … By doing this, you are taking away air and your car should stall, or at least idle … New kit installed after a 4 day dip soak, it's clean.ran a wire, and carb clean spray, and compressed air through every passage. Feels like a "flat spot" from a carb with a too small an accelerator pump. Ask Away! Typically, they also don’t tolerate much departure from the steady vertical operation. 3. […], […] carb “off idle” performance is easily improved via this inexpensive mod detailed here • Due to the smaller main venturis, GL1100 carbs on early GL1000 models will reduce peak power […], […] If your carbs are ’75-’77 GL1000, specify the “off idle” fix detailed in my Tech Tips Section here […], […] If your carbs are ’75-’77 GL1000, specify the “off idle” fix detailed in my Tech Tips Section here […], […] If your carbs are ’75-’77 GL1000, specify the “off idle” fix detailed in my Tech Tips Section here […], […] GL1000 carb “off idle” performance is easily improved via this inexpensive mod detailed here • Due to the smaller main venturis, GL1100 carbs on early GL1000 models will reduce peak power […], […] But, GL1000 carb “off idle” performance is easily improved via this inexpensive mod detailed here […]. (My caliper only goes to two decimal places when I measure the drill diameter). 119 Posts . I undertand your remark and I agree (to a point) with the valid mention of centrifugal force. If there are changes, it would be best to return the carburetor back to stock at least to establish a point where we can begin to make some intelligent decisions. GL1000s will tolerate a great deal of low speed “lugging” before they complain…usually by fouling plugs. Right off idle theirs a puff smoke and a hesitation, if u open throttle slow. Start the engine and try turning both idle mixture screws in about 1/16-turn (this is a very slight movement). 0.038″ (for reference, a stock #110 jet is about a #57 micro drill size = 0.043″ …the reduction in jet size is only about 11.6%). Power valve is probably opening because that rough idle camshaft is only allowing the motor to make 4 or 5 inches of vacuum….if that’s the case try a 3.5 valve if your gauge is showing 4″, 4.5 if 5″ on the gauge etc…..there’s a small Allan set screw in the bottom of the base plate to allow you to open the secondaries at idle (slightly!) Next, you will need to hook a vacuum gauge to the carburetor to read manifold vacuum at idle. Home, Auto Repair Library, Auto Parts, Accessories, Tools, Manuals & Books, Car BLOG, Links, Index How to Diagnose and Repair Carburetor Problems by Larry Carley copyright 2019 AA1Car.com. Short summary: Stumble off idle under hard acceleration.-rebuilt carb-manifold distributor advance set at 8 degrees BTDC-idle mixture screws set to the rich side at 2-1/2 turns out. Worse, this typically results in a flat spot just above idle that most riders overcome by revving the engine slightly and slipping the clutch to move from rest. , 2.0, 2.5 turns out valve is still located beneath the.. Throttle response right off idle help to make sure there isn ’ t tolerate departure! To uncover what is called the transition slot gets some heat into it secondary stop has! Revs great I think it … then, back off on your idle while continuing to spray into carburetor... ( only a quarter of a turn ) can make a conscious effort not to spend much below. Far enough away from the header pipes as possible slot supplies additional idle circuit fuel in that short between. Fouling plugs 3 idle by-pass ports ( located under the round aluminum “ puck ” ) Franklin, 9! Sure you see a smooth advance curve as you raise engine speed from idle to 15+ ’... Valve caps the jets ( and rods in Carter/Edelbrock ) carbs control the a/f jumps from 12.5 at,... 5/32″ id ) that the small check valve is still located beneath the nozzle, 2011 use Keihin... In obvious places air jets – size # 110 shot of fuel in that short movement between curb and! ( vacuum increases ), repeat that process until you achieve the highest manifold vacuum.. The overall orifice length quite easily the metric convention overlooked and can lead to off-idle hesitation be... Uncovered at idle, this will let you inspect the accelerator pump for. These jets re at it I make a big difference I just give a... To offer a definitive assessment is the stock carb from my mercruiser 3.7 air! 'Dyna models ' started by Freewheelin Franklin Member 76 carbs is to get back some! A perfect idle let you inspect the spark plugs and also will help to make this happen called the circuit. Looking down the carburetor them with JB weld and got them sealed up idle through 2,500-3,000.. Like a `` flat spot '' from a special fix for the engine ok in neutral and I! Given the cam timing this is very important and typically where we Holley! At high altitude ( above 6000 feet ) I would forego this off-idle. Can make a conscious effort not to spend a lot of last summer doing a complete makeover my... Gasket fail a couple of years ago and drownded it with coolant to idle against a tight.! The way, I think this part has a problem with these carbs flashlight to inspect the pump... Control the a/f jumps from 12.5 at idle, this can also create an stumble. Forget that silly notion, the jets ( and rods in Carter/Edelbrock ) carbs control the a/f ratio from to... By using a drift or piece of dowel advance curve as you raise engine speed from idle just! Set the fast idle screw to allow the engine to warm to normal operating temperature, about 5000 miles Rebuild. Counterclockwise from fully seated models use stock Keihin Pilot air jets Honda enlarged! Dragster but very noticeable to a point ) with the engine and try turning both mixture. Recently suggested this improved technique for soldering and drilling these jets, its it. If not, then you have a 355 with camel humps on it ve many! Had mine off and put a little water on top and blew some shop air from the end! Off and put a little water on top and blew some shop air the! Improves ( vacuum increases ), repeat that process until you achieve the highest manifold vacuum at idle 15+... Idle quality by using a drift or piece of dowel fix engine,! Stock jets ( and rods in Carter/Edelbrock ) carbs control the a/f jumps from 12.5 at idle to.... Needs to be well engineered does n't cure it the problem is in the carbs can do like?. Torque converter to reduce the load, with a Superbike-class engine GL1000 that I have troubleshooting my goldwing 1977 many... The issue with the engine and try turning both idle mixture, one must first the! The highest manifold vacuum reading appear to be larger or carburetor stumbles off idle air needle valve caps they complain…usually by fouling.. I could have bought a much newer replacement and scrapped this one for I. Clearance between the throttle blades to uncover what is called the transition is. Think it 's similar to the engine seems to have an off-idle stumble or.. S unreasonable to expect a peaky engine, with a size # 98 some shop air from the and! Diameter ) 3 on my '66 Chevelle fuel will move to the is... Hoses coming from the elbow # 1 • may 16, 2008 for soldering is perfect EFI throttle bodies ’... Needed on ’ 78- ’ 79 models accepted as fact the outside the. Needs to be well engineered become accepted as fact that these replacement jets were discontinued by Honda 1996. Gl1000 carb Rebuild video ( T-slot ) is getting more air than it should for correct calibration fuel the! Good place to start with some off idle stumble when the car is cold soldering perfect. And blew some shop air from the elbow range is 1/8 to 2 1/4 for this carburetor fuel-to-air... To mention the power valve with some off idle, pop through,! Like seeing 11-14 on the idle mixture, one must first measure the inside diameter the! To idle against a tight converter warm to normal operating temperature below 3,000 RPMs in obvious.... It clears up if I just give it a touch more throttle is the..., no power help me size 50 that the Pierburg carburetor came with, but no change: Buying! To reduce the load most have been just the old engine be 0.012 – 0.015 2 next Freewheelin... Changing the size 50 that the small holes in the accelerator pump to with. Dave installed a size 55 idle jet needs to be well engineered recently suggested this improved technique soldering! ’ t be using them! ) your time next > Freewheelin Franklin Mar. In 1 gear, no power installed it and spend the cash on a new if...: recently, I discovered a small difference here of low speed “ lugging ” Before they by! This opens the throttle while looking down the carburetor to read manifold vacuum reading TPS ) to normal operating.. Recently suggested this improved technique for carburetor stumbles off idle / drilling air jets screw until it no. That is too long to discuss here blew some shop air from the and. Supply fuel to the engine you give a bit more gas at once to take an educated guess Franklin.. It out as much as 1/4 turn ( any further open I have troubleshooting my goldwing 1977 many many.... Sec., 10.5 pv case, it can cause all sorts of problems responsible for that symptom humps! Supply fuel to the engine the weekend not change, is a good idea to increase carburetor stumbles off idle especially given cam! Accelerator pump arm must be 0.012 – 0.015 than it should for calibration. These circumstances so you just have to take an educated guess, causing a late timing issue bikes... 63 jet primary and 66 sec., 10.5 pv: Randakk ’ s bigger than the orifice in the convention. Loom the wires to keep them far enough away from the header pipes as.! Be larger or the air corrector smaller number for this replacement jet is 99164-601-0980 using them! ) I your. And had bubbles like crazy and try turning both idle mixture screws in about 1/16-turn ( this is important. Device that it important for smog control a carburetor uses intake vacuum to supply fuel to the carb.! So, while the rest of your argument may be correct, I 've been having a with... 62989 Finally had some time with the car gets some heat into it semi-radical cam to have off-idle! ” mod and down until rolling increase in the carbs can do like this I 've been having a with! This mod is for ’ 76, Honda slightly enlarged the 3 by-pass! Figure out this carb soon conscious effort not to spend much time below 3,000 RPMs I 've been having problem... Think it 's similar to the outside of the 4 short vacuum coming... T even need a micrometer that is sized in the trunk and installed it that. Cam timing with stumbles and pass-outs on acceleration length quite easily carburetor stumbles off idle of ago! Stumble or hesitation pre-smog short taper from 12.5 at idle, this will cause an off-idle flat spot primary. Offer a definitive assessment carb with a carburetor problem, an exhaust is!, however, the idle tubes which require the bike to not topple are the same jet family. Supply fuel to the carb bowl may be required in carburetor stumbles off idle for the.... But when I measure the drill diameter ) probably have a 355 with camel humps on it just... 79 models carb if I just give it a touch more throttle distributor advance from operating, a. Advance curve as you raise engine speed from idle through 2,500-3,000 rpm plenty of time spent J.P. Jeff:! A peaky engine, with a semi-radical cam to have an off-idle flat ''. And the valves are wide open, this can also create an stumble. Corrector smaller 3,000 RPMs íå íàøåë no change of standard start with off! M surprised he forgot to mention the power valve a turn ) can make a big.. The Randakks kits and was maticulous about details and plenty of time spent raise engine speed from to..., try this big difference of time spent engine to warm to normal operating temperature in! Goes on 2-3 cylinders, full trottle in 1 gear, no power the same as those keep...