Re: Compression test for '98 150HP
Remove all the spark plugs. Stick a compression gauge into one of the plug holes. With the ignition switch in the off position, use a jumper wire to energize the starter. (one end of jumper to battery cable on solenoud, the other end to small yellow wire on primary winding). Now run the motor thru several revolutions until peak reading is achieved on gauge. Note cylinder number and pressure. Repeat for rest of motor.
