Chrysler 20 and 30 HP Outboard Motors Service Manual OB 3435, Page 20Get this manual
TROUBLESHOOTING GUIDE (Con'd)
LOSS OF POWER (Ignition OK)
Power Head Carb and throttle cam not synchronized Air leak at cylinder head gasket Warped cylinder head Excessive carbon build up Stuck or damaged piston ring Scored cylinder or piston
Carburetor Improper fuel mixture Improper carburetor adjustment Choke not adjusted properly Air leak at carburetor gasket Inlet needle and sea worn or stuck Incorrect float setti ng Broken reed valves (backfires) Altitude horsepower loss (See Tab le 6)
Lower Unit Bent propel ler (vibration) Exhaust outlet clogged No lubricant Bent gear housing