1976 Johnson 2HP 2R76 Outboard Motor Service Manual, Page 17Get this manual
TROUBLE
POSSIBLE CAUSE GEXHAUST GASES ENTERING COOLING SYSTEM See Section Damaged water tube grommet or "0" ring Exhaust housing to lower motor cover gasket damaged 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 Loose armature plate screws or worn armature plate liner AMOTOR ADJUSTMENT Incorrect tilt angle (smoking) BCAVITATION Protruding hull attachments Keel too long Transom too high CBOAT Improper load distribution Marine growth on bottom Added weight (water absorption) Hook in bottom Mis-matched boat and motor (boat under-powered)
2LOSS OF POWER(Assuming Ignition OK) (continued)
3MOTOR MISFIRES (Assuming
Fuel SystemCarburetor OK)