1971 Evinrude StarFlite 100 HP Outboards Service Manual, PN 4753, Page 16Get this manual
2-9 TROUBLE CHECK CHART (CONT) TROUBLE 4ENGINE MISFIRES (Assuming Fuel System and Carburetor OK) (Cont) POSSIBLE CAUSE Incorrect spark plugs BDISTRIBUTORSee Section Incorrectly adjusted breaker points Incorrect timing Distributor assembly dirty inside Loose wiring Rotor pin missing Loose sensor Loose distributor base retainers Coil or pulse pack CORRODED OR CRACKED DISTRIBUTOR CAPROTORSee Section Rotor wave washer missing Loose distributor ground wire Carbon path in distributor cap or rotor Loose or shorted sensor leads AINCORRECT PROPELLER Prop shaft bearing housing improperly installed Incorrect tilt angle Poor fuel mixtoo much lubricant (smoking) Remote controls incorrectly adjusted Propeller hub slipping Bent or worn propellercoverging ring missing 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 propeller (vibration) Transom too high CBOAT Mounts loose loss of rubber bond Improper load distribution Marine growth on bottom Added weight (water absorption) Hook -in bottom ACONTROL BOX AND ELECTRICAL CONNECTIONS See Section Control box andor power head connections not coupled corroded or coupled incorrectly 20 ampere fuse Faulty electriC control switch Open circuit (broken wires) Faulty key switch Shift and rectifier diodes damaged BLOWER UNITSee Section Incorrect lubricant (Type "c" only) Oil pump screen plugged Faulty solenoids or adjustment Damaged shift cable Oil pump wornlow oil level Shifter dog or spring damaged AALTERNATOR SYSTEMSee Section Faulty wiring Clipper circuit faulty Rectifier diodes damaged Shift diodes shorted Shorted or open stator windings ASTARTING CIRCUITSee Section Weak or shorted battery Loose or corroded battery connections Safety switch inoperative or out of adjustment Throttle advanced too far