2005-2011 Honda FourTrax Foreman TRX500 FE/FPE/FM/FPM/TM Service Manual, Page 156Get this manual
CYLINDER HEADIVALVE
TROUBLESHOOTING
Engine top-end problems usually affect engine performanceThese problems can be diagnosed by compression test, or by tracing top-end noise with sounding rod or stethoscope If the performance is poor at low speeds, check for white smoke in the crankcase breather hoseIf the hose is smoky, check for seized piston ring (page 9-2),
Compression too lowhard starting or poor performance at low speed