How does the idle work on a carb?
The PILOT jets aren’t delivering fuel. Not the mains. The way carbs work is there are three different “circuits” for fuel: idle, pilot, main. The idle is obviously what gives you fuel during idle. The pilot serves as a gradual step as the circuits trade off from the tiny idle circuit to the relatively large main.
What causes a motorcycle to stall at idle?
Or, you could have air leaking around the throttle, just enough to lean it out at idle; the mounting boots could be the leak, or diaphragms in the carbs, that kind of thing. Wow, thanks both of you! I will try these things when my mechanic manual comes for this bike, the owners manual is like “here is the start button, a durr.”
What to do when your bike Idles but dies?
Either way the solution is the same. Pull the carb bowls off. Pull the jets and clean them til you can see perfectly through them. Use carb cleaner, and compressed air or my favorite a few strands of stripped electrical wire to push all the gunk out of em. TPS sees fuel going in and compensates, but compensates for nothing. I had the same happen.
What causes a carburetor to get plugged up?
Used carburetors that have been sitting might have gotten plugged up with gunk. If that gunk is blocking the main jet and/or partially blocking the fuel flowing into the float bowl, that could cause the problem you are describing. Sounds like a vacuum leak or too lean carb settings.
What causes fuel to come out the carbs?
Idles fine, won’t power up worth a darn, fuel coming out the carbs: sounds very much like what happened to me last year, which was one flooded cylinder. Lots of false starts before coming back to the carbs — a valve needle had a bit of gunk on it so fuel flow wasn’t being shut off by the float valve, flooding the cylinder.
Extremely lean motors can also stall out completely when given some light throttle. Another sign of lean running is the “hunting idle” where the motorcycle revs up randomly, changes RPMs, or takes forever to come down to idle.
What should I do if my carburetor is not working?
For carburetors that suddenly show signs of being in a rich condition, gently whacking the bottom of the carbs to make sure the floats (tiny little pieces that control gas flow like the rubber piece in the back of your toilet) are free. Also check that the choke cable works.
What to do when gas comes out of CARB?
Check your plugs: one is likely very wet. Then run the engine and pop the wire off that plug and see if it changes how the engine runs — if not, that cylinder isn’t firing. Check to make sure that the plug is actually giving spark.