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On a bike like the CB350F the pilot jets are tiny, making it even harder. Menu. Clogged jets are the number one reason a carburetor doesn’t work right. Any ideas on what to try? PAJ1 is located on the top of the carb (#2 in diagram below). My local bike store has pilot jets for $3.00..... replacing it is smart! I have attempted adjusting the pilot screw, which did alleviate the popping symptoms and gave me a much smoother ride at 25 mph. No hole at all. On some models you can do this with the carb on the bike but it's cleaner / … Soak it and blow compressed air through it until clear. Will Sea Foam clean clogged pilot jets by running through motorcycle gas tank? Cylinder, piston or rings worn or broken. In all my googling, I haven't found a description of quite these symptoms. RPMs Increase Only When Screw is Turned Completely In – Too rich of a mixture at idle (IF adjusting pilot fuel screw type) – Too lean of mixture at idle ( IF adjusting air screw type) Another sign of a pilot jet starting to get clogged up is a longer time for engine to warm up on choke. The slow jet feeds gas at idle speed to 1/4 throttle, main jet 1/4-3/4 throttle, and both are feeding from 3/4-full throttle, for example, many bikes are different. Open the throttle, and it seems to lean out and die, like blowing out a candle. Well I have to say thanks once again to the everyone here for helping me diagnose my 1/4 throttle sputtering problem. I cleaned out the jet and put everything back together....starts and runs longer this time, but still bogs and dies after about ten seconds. Fine - only this happens twice every summer. If your bike is idling, then you are probably pretty close to the correct pilot jet size. If you can find a dead range in your rpms that has little power, but has great power in other ranges, that indicates that it is possible that one of your jets is partially or fully clogged. Last summer I took the bike to the shop and asked them to clean all the fuel lines and tank. clogged jets will cause that problem as well as a clogged in-line filter, a clogged petcock filter as keni replied. Emulsion tube orifices - if clogged, these will affect fuel flow into the carburetor when the bike is at 1/8 throttle or greater. Alfred W. Lv 6. But the problem is…getting it to rev off of an idle, it wants to stall. With the float chamber removed, you'll be able to see: the main jet, floats, primary jet (also known as the pilot jet), and overflow pipe. If this happens, your bike won't start or idle. The floats can be made from either plastic or brass. One problem is the engine dies if I give it gas without the choke. My local bike store has pilot jets for $3.00..... replacing it is smart! There are other bleeds but the ones that give us the most problems are the Pilot Air Jets or PAJ1 and PAJ2 . Thanks. It makes a difference. These are easily clogged especially when ethanol gas is used. So, I'm attempting to fix a neglected '86 Yamaha Radian, it has Mikuni BS30 round slide carburetors, which were quite gunked up. Lean symptoms - if the bike surges, carb spits when throttle is opened, exhaust backfires or pops when throttle is closed, or the engine has trouble idling down, engine needs a larger pilot or slow jet to correct. Sometimes it just takes a lot of time and effort to get them clean. An online community for motorcycle riders and enthusiasts. Well get to what to … It can be found under a rubber plug and has a slotted head that can be screwed out. Bike is a Honda Shadow 1100 Sabre sits for weeks at a time. I tried the seafoam trick and it didn't seem to get it. A clogged main jet in the carburetor, a clogged pilot jet, stale fuel, or leaky gaskets around the carburetor are the most likely culprits. Low compression: Spark plug loose or damaged threads. Entertainment Music TV & Film Performing Arts Visual Arts Fashion & Style Love & Romance Gaming Hobbies Fine Arts & Crafts Astrology Card Games & Gambling Cars & Motorcycles … Incorrect jet sizes. To cure poor low speed / idle the service the idle circuit as follows. Incorrect fuel level. So, time for a cleaning. Ok, this is the fourth time it happens: bike starts with choke on full, runs like crap and dies the moment the choke is turned off. Diagnosing motorcycle carburetor problems is relatively easy, thanks to three telltale symptoms. To learn more about the right type of gas to use on your motorcycle, see my article here. :redflip 2. 0 0. Correction: Mikuni replace pilot jet with next richer and test again. If you want to check your plugs you'll be going past the carbs anyway (unless you try to do only the rear or do the front the hard way). The emulsion holes in pilot jets are so small that they block very easily and degrade performance. Am now running a 42.5 pilot, 135 main and needle clip is set on the second from the top slot. If the engine idles rough, fouls plugs, or is hard to start, pilot is to big, or rich. Then I'll check for leaks. I’ve tried opening the pilot screws from 2 turns out to 4 turns out but still the stalling trying to rev off an idle. Have had this before, idle/pilot jet clogged. 1.) Did I get bad gas this time because normally it takes a week or 2 to clog again but this time it is happening back to back. It clogs easily. Now all put back together with new pilot jet screws #36 (old ones to clogged to save), it idles fine, which it didn’t do before. There is also some throttle hesitation during normal riding. 2 strokes are very sensitive to this. Boil them repeatedly. Thanks. Clean out the jets whether or not you can see through them. Checking for a clogged pilot jet isn't too bad. This circuit delivers fuel for idle, and has the smallest passages found in carburetors. Pilot jet - the orifice in this jet is .172mm in diameter. PILOT JET: The pilot jet is a medium size (¾-1”) brass jet located inside the float bowl next to the needle jet/main jet location. But here are a few: 1) Poor idle quality 2) Poor transition from idle to midrange rpm 3) Hard starting 4) One or more plugs show a lean condition (a reason to check them often). Air cleaner clogged, poorly sealed, or missing. A bike has several jets and sometimes more then one hole in them. Re: symptoms of a clogged carb Symptoms that point to carb issues are sometimes subtle and sometimes very obvious. Hard starting when hot or cold, poor response when opening the throttle, reluctance to idle, all of these are symptoms of an improperly sized pilot jet or incorrectly adjusted air screw. Warning… By following these steps you will instantly save money by not paying for someone else to diagnose your problem. Wayward Son Wayward Son Get Help Now; Members; 65,660 posts; Location: Colorado; Posted March 8, 2009. its aitr screw. Symptoms - machine will not rev has no power, will stall when the throttle is opened. This baby has to be super clean! 1. the harley guy tells you the pilot jets are clogged. The pilot jet meters the fuel required for engine starting, idling and the initial throttle opening 0-⅛. Fuel goes bad after time, and the first circuit/jet to clog with varnished up fuel is the pilot jet. Cylinder head nuts not torqued properly. After cleaning the carbs out, the bike starts and idles, but that's it. Air screw is out 1.5 turns. As mentioned earlier, the pilot jet (idle or slow speed circuit) and the air screw work together to supply fuel to the engine at idle and the lowest power 83-=88settings. Starter jet clogged or restricted. Pilot jets are ALWAYS the hardest things to clean out. Let them soak long and hard in carb cleaner. Make sure you use TK (Teikei) jets. A pilot jet has many fine holes in it to atomize the fuel..... if you can only see one hole open it is clogged. They’re also the jets most likely to get clogged. Pass a wire through the jet and … 9) PILOT (SLOW) JET: There will be one final jet in this area, the pilot or slow jet. I think there are some write-ups around here and elsewhere. And worse, many claims of lean conditions and rich conditions are contradictory. And revs up fine passed 1500 RPMs. a dirty air filter or a cracked intake boot which is the rubber piece between the engine and carb. Bike starts second kick, and the air screw. Slow jet or air passage clogged or restricted. I took the carb apart again and the jet is clogged almost all the way closed again. If your motorcycle is running rich, you’ll usually be able to smell a difference in the exhaust if you pay attention. Pilot screw maladjusted Pilot jet, or air passage clogged Air bleed pipe bleed holes clogged Pilot passage clogged Air cleaner clogged, poorly sealed, or missing Starter plunger stuck open Fuel level in carburetor float bowl too high or too low Fuel tank air vent obstructed Carburetor holder loose Air cleaner duct loose. I had to limp the scooter home and it was pure torture, having to rev up to get her moving or else she would die. so I take the carb apart and look around, and it turns out that the pilot jet is completely clogged. 3) Clogged main jet - This will only happen with extreme dirt and varnish. more then likely your idle jet will be clogged also. This jet controls the fuel while the bike is idling and is normally in the worst condition. Stock jetting was 40 pilot, 140 main and the needle on the meddle clip. 5) Lack of high end power 6) Poor hole shot Don’t stick your face down by the exhaust , just stand next to the motorcycle while it’s running and if it smells really strong of fuel then that means your engine is running rich and you need to adjust your air to fuel ratio. As the floats are somewhat delicate, they should be removed first. Your car's carburettor comes equipped with several jets, depending on the model. 1. recently my pilot yet has been getting clogged once a week atleast, i even put an inline filter and still got clogged yesterday, everything is stock e pilot jet keeps getting clogged - www.DRRiders.com 469 Posts . Let’s dive in and quickly go over what you need to do to get your engine running with the choke open so that you can start powering your house! Whether your motorcycle is fouling plugs, dropping cylinders, popping and spitting or even why it doesn’t run at all, this simple diagnostic method provides not only answers but it lines you up for the proper steps to take when a repair is needed. clogged pilot air jets; secondary and primary air jets reversed; aftermarket jets poorly sized ; jets modified by previous “mechanic” deteriorated internal o-rings in carbs; bad central plenum gasket; float levels too high or poor alignment; floats “fouling” on side of the fuel bowl. The needle can make all the difference in the world for the power of the machine in most situations, as it controls the throttle range that most riders spend most of their time using. You have to remove the airbox or filters if you have individual filters to get to it. I removed the carb in the street and the pilot jet was clogged, drove for a bit and same thing, clogged again. This is a classic symptom of a partially or fully clogged pilot jet. Diagnosing motorcycle carburetor problems is relatively easy, thanks to three telltale symptoms. anyhow there all cheap so if you like it, buy it if its cheap enuff . Time to clean that carburetor. – Clogged slow-jet circuits – Clogged transfer ports – Clogged choke circuits – Clogged fuel screw or air jet passages. You'll also be close to the fuel pump, so might as well rule that out while you're checking. Start the engine and let it idle. SOUTH BAY RIDERS Forums. set ti at 1/2 turns out and adjust the idle speed accordingly. Share this post. By paying attention to your vehicle symptoms, you can learn whether one or more jets are clogged and in need of service. hmmmmm, lets see, i wonder why he looked at that first... damn that guy must be a bad ass at fixing leaks and cleaning out jets. It isn't giving me the other typical symptoms of a clogged pilot jet, but I'll pull it anyway. 2. Terms often used are: Stuttering Hesitating Running Rough etc etc . fix - See carb cleaning section prevent - install inline fuel filter and always store machine with a full tank of gas. Menu. Discussion Starter • #1 • May 4, 2012. 1 decade ago. By paying attention to your vehicle symptoms, you can learn whether one or more jets are clogged and in need of service. Home. Link to post Share on other sites. Keihin replace pilot jet with next richer and test again. Share this post. Piston ring/land clearance excessive PILOT JET TO LEAN: RPM does not become erratic and motor maintains throttle when air screw is turned all the way clockwise. In order to truly tune my carb, I want a better understanding of the symptoms of lean vs the symptoms of rich. Stale Fuel Can Cause Your Generator to Stall When the Choke is Opened . Your bike wo n't start or idle completely clogged of quite these symptoms with varnished up fuel is rubber! # 1 • May 4, 2012 25 mph have individual filters to get to.! 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