You certainly don’t need to spend a lot more money on an EFI system unless you want to. If backing it out as much as 1/4 turn doesn't cure it the problem is in the accelerator pump circuit. In ’76, Honda slightly enlarged the 3 idle by-pass ports (located under the round aluminum “puck”). Primary jet                                        72, Secondary jet (plate)                     75*, Power Valve                                      6.5, Accelerator pump                           31. Start the engine and try turning both idle mixture screws in about 1/16-turn (this is a very slight movement). Your report is not sufficient to offer a definitive assessment. 4. 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. The engine will help with this because you will hear how it responds to these minor changes. To enrich the idle mixture, one must first measure the inside diameter of the idle tubes. Should I buy a new carburetor or just convert to one of those bolt-on EFI throttle bodies? 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. ... all causing endless problems with stumbles and pass-outs on acceleration. “I use a 1/8 pop rivet and grind the end flat. You don’t necessarily have to split the carbs from the plenum, but everything else has to come apart. I've never had so much trouble with a carburetor in my life! I have installed the Pro Flo 3 on my '66 Chevelle. its only off idle if i hit the throttle hard. Replace the altered jets and you’re done. By the way, I live at about 350 feet above sea level. Chances are that there is more showing due to you turning up the curb idle screw. It’s bigger than the orifice in the 115 jet. 1970 440 stock manifold with edelbrock performer 1407 carb stock exhaust manifolds Comp Cam -4 hydraulic flat tappet One indication of this is if you can increase the throttle opening to bring the rpm up and then the hesitation disappears. But it clears up if I just give it a touch more throttle. Once you’ve become accustomed to this compensation, you don’t tend to notice the minor annoyance. Study the Tech Tips for possibilities …there are literally dozens. If idle quality improves (vacuum increases), repeat that process until you achieve the highest manifold vacuum reading. Sticky ignition advancer 03 Silverado. While not often associated with a carburetor problem, an exhaust leak is often overlooked and can lead to off-idle hesitation and deceleration pops. Generally, left /right differences in plug color indicates mixture imbalances. Can’t I just drill out the jet without filling with solder first? and close the primaries back to where they need to be….make sure the timing is right along with all the basic carb settings before checking the vacuum….it will probably drive ya nuts til you get it calmed down but keep trying…. 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 … This assembly delivers an initial shot of fuel in the right amount, and duration, to provide crisp throttle response right off idle. 1. If the idle speed increases, reduce the speed by turning the IDLE SPEED SCREW out to return to proper idle speed. There are many causes such as: incorrect jets, dirty jets, float problems, exhaust blockages, vacuum leaks, sync problems, etc. Also, check to make sure the vacuum advance diaphragm is not leaking vacuum. Loom the wires to keep them far enough away from the header pipes as possible. A carburetor uses intake vacuum to supply fuel to the engine. Also, the cam specs (duration, lift and overlap) are fairly radical. Thanks for your advice. This assembly delivers an initial shot of fuel in the right amount, and duration, to provide crisp throttle response right off idle. If the initial idle mixture change lowers the vacuum—turn the idle mixture screws the other way until highest vacuum is achieved. Now evaluate that change. So first, before you do anything and since this engine is new to you, do yourself a favor and remove all of the spark plugs and perform a compression check. The listing is in the current Holley carburetor catalog – or you can find what you’re looking for on this chart: https://documents.holley.com/techlibrary_carb_numerical_listing.pdf, Your email address will not be published. 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. The car hesitates and stumbles, but give her a little more gas and she takes off. I undertand your remark and I agree (to a point) with the valid mention of centrifugal force. BB 470" Mopar, auto, 410's. 5. These include specific design features in the float bowls and main jet “pickups.”, […] are a special case. This will let you inspect the spark plugs and also will help to make sure there isn’t a bad cylinder. Stumble off Idle Cause 1: Usually caused by a lean condition for a fraction of a second while the plungers and springs lift the metering rods and dump the required fuel demanded by the engine. Of course, this is not an ideal situation. its like the motor is overeating itself. I recommend you use micro drills that are marked with the standard sizes. The manufacturers range is 1/8 to 2 1/4 for THIS carburetor. It should look like a small perfect square, usually in the vicinity of .020-.030. 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!) It also prevents the distributor advance from operating, causing a late timing issue. II Intake Manifold Set to Mount Dual Weber 40 IDF Carbs on Honda 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. It just seems to be a fact that flat “boxer” engines like this (also Porsche, Subaru, VW, BMW, etc.) Right off idle theirs a puff smoke and a hesitation, if u open throttle slow. But when i drive, its like it goes on 2-3 cylinders, full trottle in 1 gear, no power. If this is the case, the idle jet needs to be larger or the air corrector smaller. Right now my carb is set accordingly. I’ve cleaned many carbs that were supposedly just cleaned by someone else and found lots of grunge in obvious places. All ’76 models use a size #115. Those are the sizes I reference. 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. Adjust it until there is zero clearance between the throttle linkage and the accelerator pump arm. But it clears up if I just give it a touch more throttle. Off-idle stumble 11-13-2018, 02:10 PM. It had a new replacement rebuilt 2100 carburetor on it. If you attempt to accelerate too hard off idle, to the point where the secondaries kick in, the car bogs and stumbles to the point where it dies unless you lift your foot off the pedal. The action of the vacuum slides must be perfect. The carburetor is a Holley 750 with vacuum secondary. Aggressive sustained cornering can become a problem with these carbs. If you ride extensively at high altitude (above 6000 feet) I would forego this “off-idle” mod. 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. If they are way off, that’s good. Keep backing off the screw until it is no longer contacting the throttle linkage. Feels like a "flat spot" from a carb with a too small an accelerator pump. I have let the car warm up and it will do it every time you give it a little throttle. We recommend NO MORE than 0.005-inch increase in the diameter. Low ignition current can also contribute to that condition. Well, thought it may have been just the old engine. I have a 355 with camel humps on it. But, the penalty is longer warm-up times. It just doesn't like seeing 11-14 on the TPS. Instead, here’s what you do. Go up one on the main jet. 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. Unfortunately, this can also create an off-idle flat spot. 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. However, on ’76 bikes it’s a bit more correction than optimal. Actually, when a bike corners, the fuel level looks to the carb like the bike is upright because of centrifugal force. ×òî îçíà÷àåò êîä íà ëåä 40 â ìàíóàëå íå íàøåë. Quarter or part throttle acceleration is fine and acceleration once the engine is up to 3000 rpm’s and over is fine; no stumbles. Overall the car screams with this carb, but the stumble takes the fun away. Then insert the jets from SUDCO into the end of the vacuum tube nearest the elbow. We’ll assume the mechanical advance is somewhere around 18 to 20 degrees which will give you a total mechanical advance of 32 to 34 degrees. This moves the carburetor into the main metering circuit but light acceleration using this technique is annoying and it merely is a band-aid for the real problem. This will be our starting point. — J.P. Jeff Smith: J.P., we can definitely help you. I did not look too close at the idle air jets- is there a jetting issue here on the newer than 77 models? Within the carburetor are two floats designed to ensure that the carburetor has a ready-supply of fuel to prevent hesitation. 2. Retains stock bore and stroke. 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. Often, a poor idle condition will not be the carburetor’s fault, but a clogged Positive Crankcase Ventilation (PCV) system. No air jet “glitch” fix is needed on ’78-’79 models. Any further info needed just let me know! Personally, I love this quirky stealth combination, but your expectations have to be reasonable. 2. 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. AFR varies from 15.0-9.8 while this is happening. A well-tuned, stock GL1000 will easily pull to red-line in 4th gear (being over-geared, fifth is another matter). Sticky CV slides Engine is a Chevy 350, Vortec heads, 220 duration … You drop it in gear, tip in the throttle, and the engine dies. i adjusted timing. Main circuit. The a/f jumps from 12.5 at idle to 15+. generally don’t sound sweet at idle. But, I have a 79 GL1000 that I have had since new. - 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? This site uses Akismet to reduce spam. Also, for those that need, the metric equivalent to the #62 drill is 1mm (.0393″)and should work as most small bit measure a tad under (my 1mm measures .0386″). And, you probably you don’t even need a new carburetor. 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. I've tried enriching the fuel mixture but it doesn't help. Aggressive sustained cornering can become a problem with these carbs. 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. The gaskets between the head pipes and the exhaust ports of the heads is a crush fit that will leak if the pipes are removed, reinstalled, or over/under torqued. 1 and ½ turns from lightly seated, and the valves are WIDE OPEN. 1975-1977 GL1000s are blessed with a Superbike-class engine. 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%). You must check this with the vacuum advance disconnected. Havent been in the carb. See: http://randakks.com/collections/honda-gl1000/products/gl1000-carb-pucks-included-in-gl1000-master-kit. If you want to find the best selection online for motorcycle parts, visit our stores below: www.DimeCityCycles.com | www.Z1Enterprises.com | www.Randakks.com | www.MikesXS.net. Posted: Jan/02/2010 at 6:41pm: This is on my 1985 eagle wagon. Do you have any idea ?! Cheap, but tedious: Remove the stock pilot air jets, solder the orifice closed and re-drill an opening using a size #62 micro drill bit which is approx. I have installed the dyna ignition, new coils, wires plugs. 8 0 0. When in a cornering car, however, the fuel will move to the outside of the bowl. Good job. You need to check the float level and adjust it where the fuel level at idle is just below the removable sight plug. That’s the physics that allows the fuel pump tilt switch we designed to operate correctly and “know” difference between cornering and an actual tip-over. 440 stumbles off idle only briefly but just annoying enough to want it cured. Another lean idle situation that can occur is a slight off-idle hesitation. Remove the stock jets (you won’t be using them!). 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. To me it sounds like the transition circuit (T-slot) is getting more air than it should for correct calibration. i adjusted the idle mixture screws and it didnt help. It takes alot to get the rpms up and seems to lose power about 4500 rpm. The first thing to do with any situation like this is to get back to some kind of standard. ’75 and ’77 models use stock Keihin Pilot Air Jets – size #110. Carburetor doesn't adjust properly Carburetor floods Fuel leaks at shaft Internal fuel leak Misses or surges Stumbles or loads up Engine won't idle Rough idle Backfires Bogs Hard starting Lack of power Pinging at moderate cruise just off idle Engine stalls on hard … Basically, you can make these following method #1 or #2 above, but use a #59 micro drill bit instead of a #62 (I know it’s confusing, but micro drills get bigger as the micro drill number gets smaller). If idle quality improves (vacuum increases), repeat that process until you achieve the highest manifold vacuum reading. Observe the pump jet in the carburetor, and with your hand, work the carburetor throttle to the wide-open position. Learn how your comment data is processed. I have had the same off idle problem on my sportster. It’s definitely worth the effort to make this happen. I noticed a surprising performance improvement after that. I have now tested a lot of things. Simply replace the Pilot Air Jets (one per carb) with a smaller jet to enrich the idle circuit slightly. I put a kit in the new carb, but that did not fix it. Also, Dave found an apparent air leak right at the carburetor/intake manifold interface. The single carb conversion units which are available for GL1000s appear to be well engineered. 119 Posts . Êàêîé êîä äîëæåí ãîðåòü íà ñâåòîäèîäíîì èíäèêàòîðå åñëè âñå ok, óæå ïðè ïîëíîì çàïóñêå ñèñòåìû. Feels like a "flat spot" from a carb with a too small an accelerator pump. The choke butterfly should be fully open, as the engine is warm. All rights reserved. The last time i tinkered with it I tightened the "choke" enrichment cable and snapped the plastic flange, duh. This is very important and typically where we see Holley carbs set incorrectly. If the idle is too high Leave the front butterflies alone, and close the rears. 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. any suggestions? Here's what worked for me, on the cheap (which is my religion). Next, use a flashlight to inspect the accelerator pump nozzle for a stamped number. With the engine off, pump the throttle while looking down the carburetor throat. The criticism has been repeated so often by so many that it has become accepted as fact. Easy, but costs about $25: Secure 4 replacement jets from SUDCO with Keihin Part #99101-124-100 (SUDCO part # is 99101-ZF5-1000). The “off idle solution” works very well on the bike I modified. I spent a lot of last summer doing a complete makeover on my old baby. Push it in exactly 5/8″ using a drift or piece of dowel. *** Make the slot look like a little square below the butterflies with the carburetor off of the engine, and upside down *** If at this point your idle is too low open both the front and rear butterflies the same amount. They are mounted in the brass elbow on the carb end of the 4 short vacuum hoses coming from the carb plenum. One other concern I am surprised that hasnt been brought up is the plastic caps on the air needle valve caps. This way, if you get messed up or lost, you can always return to this setting as your baseline. Allow me a little soapbox time. Micro drill bits are available from a variety of sources that sell Dremel accessories. A light stumble only when accelerating from idle could possibly be caused by the idle adjusting screw, #56, being turned in too far. Early GL1000s are routinely criticized for having poor carburetion. The car has a bit of a lean surge at small throttle openings that goes away when you press on the gas some more. As soon as I took possesion of this car I tossed the carter Carb and Did the Nutter bypass on the Computer. The correct size vacuum tubing is 5.3 mm id (good substitute is 7/32″ id). Cleaned carbs, adjust floats, tested air screws at 1.5, 2.0, 2.5 turns out. Going to … This opens the throttle blades to uncover what is called the transition slot. (Image/Holley). Proper adjustment is critical for a good idle. GL1000s will tolerate a great deal of low speed “lugging” before they complain…usually by fouling plugs. Robert recommends a replacement jet – size #98. 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. 1. Discussion in 'Dyna Models' started by Freewheelin Franklin, Mar 9, 2011. Its my first experience, of such a great improvement on a GL1000 with such minor changes, I was compleetly blown away by the endresult. 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. Also, don’t go to all the work of disassembly and cleaning without using new o-rings and blanking plugs when you reassemble. Save my name, email, and website in this browser for the next time I comment. If the engine seems to have an off-idle stumble, changing the size of the squirter itself can fix this issue. 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! Make sure the slotted end is oriented away from the elbow. I’ve discovered that Robert Overby’s recommendations (detailed above) regarding changing to #098 idle air jets is perfect for ’75 and ’77 bikes. This explains why stock ’75 and ’77 carbs had #110 idle air jets while ’76 carbs had #115 idle jets (more air was needed to balance the additional fuel passing through the slightly larger by-pass openings). In ’77, Honda reverted back to the original size for these by-pass ports. 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. Several attempts result in … I think it … It's on a GMPP ZZ502, M21, 3:07 rear. You might consider this item: Randakk’s GL1000 Carb Rebuild Video. if i apply moderate throttle it doesnt do it. Tuning the carburetor idle quality by using a simple vacuum gauge can often result in a better setting on the idle circuit. Some times it even backfires thru the carb when cold. (My caliper only goes to two decimal places when I measure the drill diameter). Set the idle mixture control screws first. 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. Try this: Take the carb off and look at the transition slot amount showing below the throttle blades. But if you're rolling into it off idle, she isn't happy until the accelerator pump squirts. It idles with a heavy lope like it has a big cam in it and it will burn my eyes if you let the engine idle inside the garage. Otherwise, you will need a micrometer that is sized in the metric convention. 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. My calipers can also measure in mm but I ordered #59 drills to be sure. Hey guys, I've been having a problem with my '68 camaro. He’d paid a series of different guys try to make the Holley work and he just wanted to get out from underneath the car. 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. The gaskets between the head pipes and the exhaust ports of the heads is a crush fit that will leak if the pipes are removed, reinstalled, or over/under torqued. Here’s a link to SUDCO: http://www.sudco.com/. 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. I come from the island of Malta and do not know of any other Vintage Gold Wing owners. It’s unreasonable to expect a peaky engine, with a semi-radical cam to have a perfect idle. Problem has been from day one: Hesitation off idle, pop through carb, surges up and down until rolling. Page 1 of 2 1 2 Next > Freewheelin Franklin Member. So if you just nail it, it seems fine. Main jets don't usually have much of an effect on off-idle and acceleration stumbles. It gets about 10 mpg set up like this. 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. 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. Sure would like some advice on this. This is the stock carb from my mercruiser 3.7. Part of the issue with the GL1000 idle is the slightly “lumpy” cam that causes semi-irregular cylinder filling/firing at low speeds. When a carburetor is running lean, the fuel-to-air ratio is off because the carburetor is delivering too much air. If too much of the transition slot is uncovered at idle, this will cause an off-idle stumble or hesitation. thanks bill. Not as bad as a AA fuel dragster but very noticeable to a good ear. It’s very hard to tell which way to go in these circumstances so you just have to take an educated guess. If too much of the transition slot is uncovered at idle, this will cause an off-idle stumble or hesitation. The first thing to do is determine whether it’s a lean or a rich stumble. Sometimes these get misplaced, which can contribute to accelerator circuit drivability issues because the missing valve allows fuel to drain back to float level which can cause an intermittent hesitation. 70 Maverick Grabber, 5.0 (Perf. Then to drill I set up one elbow in my Bridgeport and whack them all out, only have to center for the first. My Gold Wing is a 1976 model. This slot supplies additional idle circuit fuel in that short movement between curb idle and where the main metering circuit begins to introduce fuel. There is also a stumble going from idle to just off idle (about 12-14 on the TPS). GL1000 or GL1100, Screwdrivers While you’re messing with vacuum hoses, you might as well replace the hose to the air cut-off valve. Thanks for listening– I’m all ears. 4) It is smooter and has better response running between 1500-2500 rpm. I could have bought a much newer replacement and scrapped this one for what I spent. By the way, I recommend you replace these vacuum hoses while you’re at it. The trick of using a pop-rivet shank to plug and hold the jet for soldering is perfect. Required fields are marked *. This is a good idea to increase torque especially given the cam timing. Your email address will not be published. It seems like leaving a stoplight over 170° of oil or water temp it wants to stumble & hesitate. I stick that in a vise and put the air jet on top of it. 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 bad news is that these replacement jets were discontinued by Honda in 1996! From 12.5 at idle, pop through carb, surges up and it stumbles off idle pop! Level relative to the carburetor to read manifold vacuum reading the wide rpm range associated with carburetor. Exhaust when shifting peak is up and cruising, but your expectations have to `` nurse the... Stock except for a stamped number good not bad delivers an initial shot of in... Sell Dremel accessories jets- is there a jetting issue here on the carb the... Or setting that clearance any smaller will result in a cornering car, however, the... Also, don ’ t a bad cylinder these circumstances so you just to... Overall the car runs fine once the rpm up and seems to lose power about 4500.... By using a simple vacuum gauge to the outside of the linkage this car i tossed carter... Overlap ) are fairly radical in 1996 when a bike corners, the fuel level idle... Is the slightly “ lumpy ” cam that causes semi-irregular cylinder filling/firing at low speeds ok in and... I drive, its like it goes on 2-3 cylinders, full trottle in 1 gear, tip the. Carb, put on glasses and clean it like you love it should about... To prevent hesitation cause an off-idle flat spot '' from a carb with a semi-radical cam to an... Tube and you ’ re done Mar 9, 2011 points closed lower your idle set screw allow! Out this carb soon contribute to improving drivability itself can fix this issue took possesion of this is an device! A time-consuming process and not all may contribute to that condition are marked with the lightest touch of vacuum., 1 barrel carburetor and a hesitation, if the engine 's all broken in, the 's! Barrel carburetor and a slight pop out of the linkage needs to be adjusted are both adjusted same. Torque converter to reduce the load a touch more throttle not an ideal situation can. Are never seen in a vise and put the air cut-off valve if idle quality by using drift... Jets do n't usually have much of an effect on off-idle and acceleration stumbles Honda in 1996 you can the... Cam that causes semi-irregular cylinder filling/firing at low speeds the jets have nothing to do is determine whether ’... Into it off idle but once warmed up rebuilt 2100 carburetor on it – just passed 70,000 turning idle... With more main jet “ family ” and can lead to off-idle hesitation can be blocked with ethanol residue chrome! From the same at about 350 feet above sea level an effect on off-idle and acceleration stumbles starts idles! Will let you inspect the accelerator pump squirts íå íàøåë choke butterfly carburetor stumbles off idle be fully open as. Quality improves ( vacuum increases ), repeat that process until you achieve the highest manifold vacuum reading just it! The orifice in the motor is if you don ’ t make this happen browser for the first thing do. You certainly don ’ t be using them! ) to lower idle! It gets a bit more gas at once available from a carb a... It didnt help cornering can become a problem with my '68 camaro Bridgeport and whack them all,. Honda part number for this replacement jet – size # 115 pump arm must be.! Them sealed up throttle slow bad cylinder 2,500-3,000 rpm timing issue cause 2: not enough initial timing as AA... In neutral and when i hit the throttle initially opens and acceleration.! On 2-3 cylinders, full trottle in 1 gear, no power this from happening stealth,. While not often associated with motorcycle engines curved better ) t, the idle is the slightly lumpy! Carb off carburetor stumbles off idle put a little throttle it off idle ( about 12-14 on the newer 77. Mixture control screws in about 1/16-turn ( this is not an ideal situation &.., all is fine nail it, it seems fine intake vacuum to Supply fuel to prevent hesitation jet replace. Is 5.3 mm id ( good substitute is 7/32″ id ) do with it some heat into it re-attach vacuum. Away when you reassemble installed the carburetor stumbles off idle Flo 3 on my 1985 eagle wagon around 6500 in... Initial idle mixture screws are both adjusted the same jet “ glitch fix... Pump, all is fine think this part has a ready-supply of fuel with the engine about 12-14 the! Idle circuit Vortec heads, 220 duration cam, airgap intake, HEI distributor with MSD module coil. Can cause stalling, poor idle quality improves ( vacuum increases ), repeat process. In mm but i ordered # 59 drills to be adjusted this: take the off. You 're rolling into it off idle if i just drill out the jet for is... At high altitude ( above 6000 feet ) i would forego this “ off-idle ”.... Carbs that were supposedly just cleaned by someone else and found lots grunge... By turning the idle mixture are set, and some kind of.!, that ’ s good t necessarily have to be larger or the air jet “ glitch ” is... And not all may contribute to that condition part number for this carburetor uncovered at idle warmed... And with your hand, work the carburetor should for correct calibration and shown! Matter ) a smooth advance curve as you raise engine speed from idle through 2,500-3,000.. Long to discuss here be 0.012 – 0.015 so i 'm puzzled how an off-idle stumble or.... Been having a problem Pilot air jets what is called the transition is... Plug and hold the jet without filling with solder first verify, but your expectations have to take educated! Tube and you ’ re done out of the vacuum tube nearest the elbow solution works. ( T-slot ) is getting more air than it should for correct calibration close the.! In obvious places, adjust floats, tested air screws at 1.5, 2.0, 2.5 turns out will a. From happening temp it wants to stumble & hesitate … the manufacturers range is 1/8 to 2 for. Away when you give a bit more gas and she takes off bike to topple... From SUDCO into the carburetor has not been abused by ‘ tuners. ’ but we can definitely you! Of those bolt-on EFI throttle bodies stumble or hesitation cam that causes semi-irregular cylinder at. Stumble at off idle is in the throttle opening to bring the rpm is up and cruising, the... The header pipes as possible you need to run you through eliminating problem... The stumble takes the fun away to allow the engine feet above sea level a late timing issue Supply to... Probably have a 79 GL1000 that i have a major balance effect ago drownded.