1968 Evinrude Speedifour, Starflite 85HP Service Manual, Page 13Get this manual
TROUBLE TROUBLE MOTOR MISFlRES (Assuming Fuel SystemCarburetor
CHART (CONT) CAUSE PLUGSSee Section Crossed or reversed leads Cover or inner terminal damaged (spark plug point out of H.T.lead) Faulty leads Loose10w torque Incorrect spark plugs Defective (cracked insulator)See Section Incorrectly adjusted points Incorrect timing Loose wiring or amplifier .damaged or 100se Fiber breaker block worn Points dirty or pitted CORRODED ORROTORSee Section Loose distributor ground Worn crankshaft bearings INCORRECT PROPELLER Incorrect tilt angl (smoking) Poor fuel mixtoo much oil(smoking) Remote controls incorrectly adjusted Propel1er hub slipping Bent or worn propeller Exhaust outl et damaged or missing Bent gear housing or exhaust housing Altitude horsepower 10ss Catamaran (single engine)venturi effect Exhaust eaks Overheating CAVITATION Protruding hull attachments too 10ng Bent propeller (vibration) Transom too high Improper 10ad distribution Marine growth bott om Added weight (water absorption) Hook in bottom