2004-2006 Kawasaki 900 STX Jet Ski Service Manual, Page 90Get this manual
6-10 ENGINE TOP END Engine Top End
Remove the spark plugs and screw compression gauge firmly into the spark plug holeSpecial ToolsCompression Gauge, 20 kgfcm: 57001-221 [A] Compression Gauge Adapter, M14 1.25: 57001-1159 [B]
the throt Using the starter motor, turn the engine over withrising; the tle fully open until the compression gauge stops
compression is the highest reading obtainableRepeat the measurement for the other two cylindersCylinder Compression (Usable Range) Standard: 590 930 kPa (6.0 9.5 kgfcm, 85 140 psi) 405 rmin (rpm)