According to a Kiehin carb class I had once as a Honda tech.. here are the top 10 carb related problems reported :
1) Throttle cable adjusted wrong
2) Carb cap not tight
3) Vent lines clogged up
4) Wrong fuel line size
5) Idle air screw damaged
6) Main or low jet damaged
7) Floats, height not set or one side higher than the other
8) Carbs internal passages blocked or damaged from strong solvents used.
9) Floats, gas or solvent saturated
10) Loose or stripped screws
1) Throttle cable adjusted wrong
2) Carb cap not tight
3) Vent lines clogged up
4) Wrong fuel line size
5) Idle air screw damaged
6) Main or low jet damaged
7) Floats, height not set or one side higher than the other
8) Carbs internal passages blocked or damaged from strong solvents used.
9) Floats, gas or solvent saturated
10) Loose or stripped screws
