2009-2012 Honda MUV700 Big Red Service Manual, Page 231Get this manual
CYLINDER HEADVALVECAMSHAFT
CYLINDER COMPRESSION
Warm up the engine to normal operating temperatureStop the engine, disconnect the spa rk plug cap and remove the spark plug (page 4-8)Inst all the compression gauge into the spark plug holeTOOLSCompressio tester Adaptor EEPV303A MT26J200 (U.S.A onlv)
Shift the transmission in neutralOpen the throttl all the way and crank the engine with the starter motor until the gauge rea ding stops ris in gTh maximum reading is usua lly reached ithinsecondsCOMPRESSION PRESSURE: 550 kPa (5.6 kgfcm 2, 80 psiat 350 rpm (m in"Check that he re is no leakage at th gauge connec tionLow co mpression can be caused by:blown cylinder head gasketimproper valve adjustmentvalve lea kageworn piston ring cy linder Hig compress ion can be caused by- carbon deposits in combustion chamber or on piston head