1997-2004 Honda Fourtrax Recon TRX250TE/TM Service Manual, Page 116Get this manual
CYLINDER HEADCYLINDERPISTON
CYLINDER COMPRESSION TEST
When the engine must be running to do som" work, make surthe are8 is well-ventilatedNever run ths engine in an enclosed areaThe exhaust contains poisonous carbon monoxide gas that may cause loss of consciousness and lead to deathRun the engine in an open arlla or with an exhaust evacuation system in an enclosed areaWarm up the engineStop the engine and remove the spark plugInstall compression gaugeOpen the throttle all the way and crank the engine with the starter motor until the gauge reading stops rising