1971 Johnson 60HP outboards Service Manual, Page 16Get this manual
2-9 TROUBLE CHECK CHART (CONT) ROUBLE 40 ENGINE MISFIRES (Ass uming Fue System and Carburetor OK) (Cont) POSSIBLE CAUSE Dirt inside of distributor assembly Breaker point spring tension Lead between breakers damaged Loose breaker plate retainers Coil or amplifie damaged CORRODED OR CRACKED DISTRIBUTOR CAPROTORSee Section Rotor wave washer missing Loose distributor ground wire Carbon path in distributor cap or rotor Breaker point misalignment Ao INCORRECT PROPELLER Propeller shaft bearing housing imprope rly installed Incorrect tilt angle Poor fuel mixtoo much lubricant (smoking) Remote controls incorrectly adjusted Propeller hub slipping Bent or worn prope lle Bent gear housing or exhaust housing Altitude horsepower loss Catamaran (single engine)venturi effect Exhaust leaks Overheating BCAVITATION Protruding hull attachments Keel too long Bent prope lle (vibration) Transom too high Co BOAT Mounts loose (loss of rubbe bond) Imprope load distribution Marine growth on bottom Added weight (water absorption) Hook in bottom ACONTROL BOX AND ELECTRICAL CONNECTIONS See Section Control box and or power head connections not coupled, corroded, or coupled incorrectly 20 ampere fuse or blocking diode damaged Faulty electric control switch Open circuit (broken wires) Faulty key switch Shift and rectifier diodes damaged Bo LOWER UNITSee Section Incorrect lubricant (Type "C" only) Oil pump scre ens plugged Faulty solenoids or adjustment Damaged shift cable Oil pump worn (low oil lev l) Shifter dog or spring damaged ALTERNATOR SYSTEMSee Section Faulty wiring Shift diodes shorted Clipper circuit faulty Rectifier diodes damaged Shorted or open stator windings ASTARTING CIRCUITSe Section Weak or shorted battery Loos or corroded battery connections Safety switch inoperative or out of adjustment-,::Throttle advanced too far Defective key switch Jammed start er drive Damage starter drive parts