2006-2009 Honda TRX680 (TRX 680 FA-FGA) Factory Service Manual, Page 208Get this manual
CYLINDER HEADVALVECAMSHAFT
CYLINDER COMPRESSION
Warm up th engine to normal operating tempera -
ture Stop the enginedisconnect the spark plug cap and remove the spark plug (page 4-7)
COMPRESSION GAUGE
Install the compression gauge into he spark pl ug hole
Com pressio tester
Ada ptor
EEPV30JA MT26J200
Shift the transm issio in neutral
Open the throttle all th way nd crank the ngi ne
with th starter motor until the ga uge readi ng stops rising The axim um reading is usually reached withinsecon ds COM PRESSION PRESSURE:
510 kPa .2 kg fcm' 74 psi) at 39 rpm Imin 5