2001 Yamaha Kodiak 450 . Won't idle. Cleaned carburetor & replaced spark plug & tried to adjust carburetor screw. Hard to start without starter fluid, Runs hot quickly, and won't idle.
Your float adjustment is incorrect, asis your fast idle
SOURCE: Backfiring won't start bought new coils still won't start and pops backfires
Do you have a carburetor? If you do, it is set too rich. Also, your timing appears off. If you do have a carburetor, adjust the setting to the left a couple of turns. This will lean out the gas mixture. If you have a fuel injector, have the system checked. The air filter could be clogged and the fuel injector could be misaligned.
A backfire is often created because the timing is off, forcing the spark plugs to fire before the pistons get to the top of its power stroke, causing the mixture to burn prematurely.
SOURCE: Yamaha xl 800 won't hit top speed and won't rev out to max rpm
Did the Impeller Pitch Change? Pitch will change the Max RPM, Are you Pulling harder out of the Hole than you did prior? You may have traded Torque for Top End
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