2001-2006 Honda TRX 300EX Sportrax 300EX Factory Service Manual, Page 317Get this manual
TROUBLESHOOTING From previous page
10Remove cylinder head cover and inspect lubrication
POllibtCausa
Valve train not lubricated Clogged oil passage properly Clogged oil orifice
Valve train lubricated properly
11Accelerate or fun at high speed
Engine knockWorn piston and cylinder
Use of poor quality fuel
EKcessive carbon build -up in combustion chamber Ignition liming 100 advanced (Faulty leMI lean fuel miKture
Engine does not
POOR PERFORMANCE AT LOW AND IDLE SPEED