1968 Evinrude Big Twin, Big Twin Electric, Lark 40 HP Outboards Service Manual, Page 16Get this manual
TROUBLE TROUBLE
CHART (CONT) CAUSE SPARK PLUGSSee Section Crossed reversed 1eads Cover inner termina1 damaged (spark p1ug point out H.T.1ead) Fau1ty 1eads Loose, 10w torque Incorrect heat range Defective (cracked insu1ator) MAGNETOSee Section Incorrectly adjusted points Loose wiring condenser damaged (loose) Fibre breaker block worn Points dirty pitted
3MOTOR MISFIRES (Assuming Fue1 SystemCarburetor
4 POOR PERFORMANCE ON
INCORRECT PROPELLER Incorrect tilt ang1e (smoking) mixtoo much oil(smoking) Remote contro1s incorrectly adjusted hub slipping Bent worn Exhaust outlet damaged missing Bent gear housing exhaust housing (broken driveshafts) A1titude horsepower 10ss Catamaran (sing1e engine)venturi effect Exhaust 1eaks Overheating CAVIT ATION Protruding hull attachments too 10ng Bent (vibration) Transom too high Improper 10ad distribution Marine growth bottom Added weight (water absorption) Hook in bottom