2006 Johnson SD 3.5 HP 2 Stroke Outboard Service Manual, PN 5006562, Page 80Get this manual
POWERHEAD GENERAL
GENERAL
Cylinder Compression Testing
Start and run outboard until it achieves operating temperature, then shut OFFRemove spark plugs Advance throttle linkage to WOTInstall compression tester's hose attachment into spark plug holeWhile cranking outboard with starter, note maximum pressure reading on gaugeRepeat procedure for each cylinderReturn throttle to idle position and reconnect power pack connectorReplace spark plugs
Retaining Ring Pliers
Retaining Ring Pliers