1971 Johnson 2HP outboards Service Manual, Page 15Get this manual
TROUBLE
POSSIBLE CAUSE ASPARK PLUGSee Section Cover or inner terminal damaged (spark plug terminal out of H.Tlead) Faulty lead Looselow torque Incorrect heat range Defective (cracked insulator) BMAGNETOSee Section Incorrectly adjusted points Loose wiring Coil or condenser damaged (loose) Fiber breaker block worn Points dirty or pitted Defective breaker cam AINCORRECT PROPELLER Incorrect tilt angl (smoking) Poor fueltoo much lubricant (oil)(smoking) Bent or worn propeller Exhaust outlet clogged Bent gear housing or exhaus housing (broken driveshafts) Altitude horsepower loss Exhaust eaks 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
3MOTOR MISFIRES (Assuming
Fuel SystemCarburetor OK)