1968 Evinrude Ski-Twin, Ski-Twin Electric 33 HP Outboards Service Manual, Page 13Get this manual
CHART (CONT) CAUSE MOTOR MISFffiES (Assuming Fuel SystemCarburetor SPARK PLUGSSee Section Crossed or reversed leads Cover or inner terminal damaged (spark plug point out of H.T.lead) Faulty leads Loose10w torque Incorrect heat range Defective (cracked insulator) MAGNETOSee Section Incorrectly adjusted points Loose wiring or condenser damaged Fibre breaker block worn Points dirty or pitted Sheared flywheel key INCORRECT PROPELLER Incorrect tilt angle (smoking) Incorrect fuel mixturetoo- much(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 Catamaran (single engine)venturi effect Exhaust leaks Overheating CAVITATION Protruding hull attachments too 10ng Bent propeller (vibration) Transom too high Improper 10ad distribution Marine growth bottom Added weight (water absorption) Hook in bottom 5STARTER MOTOR WILL NOT OPERATE STARTING CIRCUITSee Section Loose or corroded battery connections Safety switch inoperative 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 terminal Shorted or open windingsarmature or EXCESSIVE STARTER CURRENT DRAWSee Section Worn or dry armature shaft bearings Excessive friction in engine Brushes not seating Dirty or corroded commutator Loose pieces Shorted armature or field Bearing heads buckled