1970 Evinrude Ski-Twin, Ski-Twin Electric 33 HP Service Manual 4687, Page 11Get this manual
TROUBLE CHECK CHART (CONT) TROUBLE POSSIBLE CAUSE ASPARK PLUGSSee Section Crossed or reversed leads Cover or inner terminal damaged (spark plug point out of H.Tlead) Faulty leads Looselow torque Incorrect heat range Defective (cracked insulator) BMAGNETOSee Section Incorrectly adj usted points Loose wiring Coil or condenser damaged (loose) Fibre breaker block worn Points dirty or pitted Sheared flywheel key AINCORRECT PROPELLER Incorrect tilt angle (smOking) Incorrect fuel mixturetoo- much oil(smoking) Remote controls incorrectly adjusted Propeller hub slipping Bent or worn propeller Exhaust outlet damaged Bent gear housing or exhaust housing (broken driveshafts) 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 Improper load distribution Marine growth on bottom Added weight (water absorption) Hook in bottom ASTARTING CIRCUITSee Section Loose or corroded battery conne ctions Safety switch inoperative (loose) Throttle advanced too far Poor or broken battery connections Weak or shorted battery Defective key or starter switch Jammed starter drive Damaged starter drive parts Worn brushes Broken brush spring Open circuit in solenoid Burned commutator Broken field terminal Shorted or open windingsarmature or field BEXCESSIVE STARTER CURRENT DRAWSee Section Worn or dry armature shaft bearings Excessive friction in engine Brushes not seating Dirty or corroded commutator Loose pole pieces Shorted armature or field Bearing heads buckled