1978 Johnson 55 HP Outboards Service Manual, Page 52Get this manual
cConnect timing light to #1 cylinderSet full ad0 vance timing at 19 B.T.D.Cat 3500 RPM MINIMUM with adjustable stop screwSecure stop screw with locknutSee Figure 4-35CdReset idle adjustment screw to idle 700 rpm maximum in reverseSee Figure 4-35A FLYWHEEL REMOVAL
Figure 4-35AIdle Speed Adjustment Screw
SAFETY WARNING
To prevent possible personal injury, or accidental starting of motor, separate the four wire cable connector between the armature plate and power packaRemove the flywheel nut using strap wrench or other suitable tool to hold the flywbeelSee Figure 4-36