1998-2001 Honda Fourtrax Foreman TRX450S, TRX450ES Factory Service Manual, Page 408Get this manual
TROUBLESHOOTING
11Accelerate or run at high speedEngine knQkcs-
Possible cause Worn piston and cylinder Wrong type of fuel Excessive carbo build-up in combustion chamber Ignition timing too advanced (faulty ignition control module) Lean f!:.lel mixture
Engine does not knock
PO'OR PERFORMANCE AT LOW AN.D IDLE SPEED
Possible cause
1Che.c;k carbur, tor pilot screw adjustment
See section ""
Correct
2Check for leaking ntake pipeLe akingFaulty insulator O-fing Damaged insulato Not leak