1997-2001 Honda TRX250 Fourtrax Recon Service Manual, Page 106Get this manual
CYLINDER HEADCYLINDERPISTON
CYLINDER COMPRESSION TEST
If the engine must be running to do some work, make sure the area is well ventilatedNever run the engine in an enclosed areaThe exhaust contains poisonous carbon monoxide gas that may cause loss of consciousness and may lead to deathRun the engine in an open area or with an exhaust evacuation system in enclosed area
COM PR ES SION GAUG E-
Warm up the engine Stop the engine and remove the spark lu Install compression gaugeOpen the throttle all the way and crank the engine ith the starter motor until the ga uge reading st ops rising Compression pressure: 1,275 kPa (13.0 kgfcm185 ps i) at 800 rpm