1993-2000 Honda TRX300EX Service Manual, Page 197Get this manual
Troubleshooting
Poor Performance At High Speed
Possible Cause 1Check ignition timing Incorrect and valve clearance Correct
Faulty ICM Faulty ignition pulse generator Faulty valve clearance
2Disconnect fuel tube at carburetor- Fuel Flow Restricted Fuel Flows FreelyI
3Remove the carburetor- Clogged and check for clogged jet lsI Not Clogged
Clogged Clogged Clogged Clogged Clean
fuel fuel fuel fuel
line tank breather strainer screen valve
4Check valve liming-Incorrect Correct