1976 Evinrude 40HP outboards Service Manual, Page 16Get this manual
TROUBLE CHECK CHART (CONT) TROUBLE POSSIBLE CAUSE ASPARK PL UGSSee Section Cover or inner terminal damaged (spark plug point out of H.Tlead) Faulty leads Looselow torque Incorrect heat range Defective (cracked insulator) BLOW TENSION IGNITIONSee Section Incorrectly adjusted points Loose wiring Coil leads loose COIJdenser damaged (loose) Fibre breaker block worn Points dirty or pitted Sheared flywheel key Linkage improperly adjusted Driver coil leads loose Loose armature plate screws or worn delrin ring AMOTOR ADJUSTMENTS Incorrect propeller Incorrect tilt angle Remote controls incorrectly adjusted 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 Catamaran (single engine)venturi effect ASTARTING CIRCUITSee Section Loose or corroded battery connections 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