1972 Evinrude StarFlire 125 HP Outboards Service Manual, PN 4822, Page 16Get this manual
2-9 TROUBLE CHECK CHART (CONT) TROUBLE 4ENGINE MISFIRES (Assuming Fuel System and Carburetor OK) (Cont) POSSIBLE CAUSE Faulty leads Loose spark plugs (low torque) Defective spark plugs (cracked insulator) Incorrect spark plugs BDISTRIBUTOR- See Section Distributor assembly dirty inside Incorrect sensor gap adjustment Incorrect timing Loose wiring Rotor pin missing Loose sensor Loose distributor base rp.tainers Coil or pulse pack CORRODED OR CRACKED DISTRIBUTOR CAPROTORSee Section Rotor wave washer missing Loose distributor ground wire Carbon path in distributor cap or rotor Loose or shorted sensor leads
AINCORRECT PROPELLER
5POOR PERFORMANCE ON BOAT