Chrysler 70, 75 and 85 HP Outboard Motors Service Manual OB 3438, Page 20Get this manual
TROUBLESHOOTING GUIDE
MOTOR WILL NOT START
Fuel System
No fuel in tank Clogged screen in tank Restricted vent in tank Defective fuel pump Clogged filter in pump Damaged diaphragm Water in gasoline Restricted carburetor jets Float out of adjustment
Ignition System
Defective spark plug Loose connections Cam or linkage improperly adjusted Sheared flywheel key Faulty ignition components
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 seat worn or stuck ncorrect float setti ng Broken reed valves (backfires) Altitude horsepower loss (See Table 6)