Have had this before, idle/pilot jet clogged. Checking for a clogged pilot jet isn't too bad. If this happens, your bike won't start or idle. 3) Clogged main jet - This will only happen with extreme dirt and varnish. Menu. Clogged jets are the number one reason a carburetor doesn’t work right. Home. 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. 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. So, I'm attempting to fix a neglected '86 Yamaha Radian, it has Mikuni BS30 round slide carburetors, which were quite gunked up. These are easily clogged especially when ethanol gas is used. Sometimes it just takes a lot of time and effort to get them clean. anyhow there all cheap so if you like it, buy it if its cheap enuff . 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. It makes a difference. It isn't giving me the other typical symptoms of a clogged pilot jet, but I'll pull it anyway. This is a classic symptom of a partially or fully clogged pilot jet. Re: symptoms of a clogged carb Symptoms that point to carb issues are sometimes subtle and sometimes very obvious. Soak it and blow compressed air through it until clear. Well get to what to … Let them soak long and hard in carb cleaner. Start the engine and let it idle. 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 It clogs easily. Cylinder, piston or rings worn or broken. Symptoms - machine will not rev has no power, will stall when the throttle is opened. :redflip 2. So, time for a cleaning. You'll also be close to the fuel pump, so might as well rule that out while you're checking. 9) PILOT (SLOW) JET: There will be one final jet in this area, the pilot or slow jet. Thanks. 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. 1. the harley guy tells you the pilot jets are clogged. To cure poor low speed / idle the service the idle circuit as follows. 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. Diagnosing motorcycle carburetor problems is relatively easy, thanks to three telltale symptoms. 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. 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. Incorrect jet sizes. Any ideas on what to try? This circuit delivers fuel for idle, and has the smallest passages found in carburetors. An online community for motorcycle riders and enthusiasts. Open the throttle, and it seems to lean out and die, like blowing out a candle. 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) 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. SOUTH BAY RIDERS Forums. 2 strokes are very sensitive to this. Air cleaner clogged, poorly sealed, or missing. Slow jet or air passage clogged or restricted. set ti at 1/2 turns out and adjust the idle speed accordingly. This baby has to be super clean! Thanks. To learn more about the right type of gas to use on your motorcycle, see my article here. 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). My local bike store has pilot jets for $3.00..... replacing it is smart! There is also some throttle hesitation during normal riding. Stale Fuel Can Cause Your Generator to Stall When the Choke is Opened . Clean out the jets whether or not you can see through them. Entertainment Music TV & Film Performing Arts Visual Arts Fashion & Style Love & Romance Gaming Hobbies Fine Arts & Crafts Astrology Card Games & Gambling Cars & Motorcycles … If the engine idles rough, fouls plugs, or is hard to start, pilot is to big, or rich. Am now running a 42.5 pilot, 135 main and needle clip is set on the second from the top slot. I tried the seafoam trick and it didn't seem to get it. 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. There are other bleeds but the ones that give us the most problems are the Pilot Air Jets or PAJ1 and PAJ2 . Fine - only this happens twice every summer. 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. so I take the carb apart and look around, and it turns out that the pilot jet is completely clogged. Pass a wire through the jet and … Stock jetting was 40 pilot, 140 main and the needle on the meddle clip. 469 Posts . 1. The floats can be made from either plastic or brass. fix - See carb cleaning section prevent - install inline fuel filter and always store machine with a full tank of gas. One problem is the engine dies if I give it gas without the choke. 2. Well I have to say thanks once again to the everyone here for helping me diagnose my 1/4 throttle sputtering problem. On some models you can do this with the carb on the bike but it's cleaner / … Then I'll check for leaks. 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