Originally posted by cyba888
When I let go of the throttle it doesnt return back to normal rpm quickly.
Originally posted by mop_iko
what caused this?
i know there are a couple of problem causes this effect.... can somebody GURU out there list down...
That is what we say "Engine Singing",You need to give her one microphone. lol
Too many possible....
let me think....
1)Idle open too much or/and low speed needle too rich;
If the singing is from high to low that means your engine has too much air flow when you close throttle. Close the idle till engine die out then open it a bit. If she is easy to die out,lean the low speed needle for compensation.
2)low speed needle too lean or longer pressure line too long;
If the singing is from low to high that means your engine has not enough fuel when you close throttle. Rich the low speed needle or shorten the pressure line.
When carburetor is very hot some fuel will be used up on cooling. It is the same as #2.
When there is any air leaking,the A/F ratio become abnormal.
5)Compression too high;
Too high compression also cause engine singing.
6).....Too many possible....