Suzuki DF200/DF225/DF250 V6 4-Stroke Outboards Service Manual, Page 60Get this manual
PERIODIC MAINTENANCE
CYLINDER COMPRESSION
Cylinder compression: Standard: 100 700 kPa (11 17 kgcm2, 156 242 psi) Maxdifference between any other cylinders: 100 kPa (1.0 kgcm2, 14 psi) NOTE: Figures shown are guidelines only, not absolute service limitsLow compression pressure can indicate one or more of the following: Excessively worn cylinder wall Worn piston or piston rings Stuck piston rings Poor seating of valves Ruptured or otherwise damaged cylinder head gasket TEST PROCEDURE 1Start engine and allow to warm up, then shut engine off2Disconnect all ignition coil connectors3Remove the bolts securing the ignition coil, then remove all spark plugs4Install compression gauge hose attachment into spark plug hole, then connect compression gauge hose to gauge hose attachment and compression gauge1Compression gauge 2Compression gauge hose 3Compression gauge hose attachment 3