1996 Johnson/Evinrude Outboards 25, 35 3-Cylinder Service Manual, Page 33Get this manual
7Inspect propeller shaft seals for evidence of leakageReplace if necessary8Drain and refill gearcaseLubricate all components of engineSee Lubrication, this section9Check propeller conditionReplace if damaged10Retorque all screws and nuts to specifications11Run engine in test tank with correct test propellerCheck cooling system operation12To remove carbon deposits from combustion chambers and pistons, inject ONIC Engine TunerLet tuner soak in engine between three and sixteen hoursAfter soaking, run engine at fast idle (1500 RPM) for at least 15 minutes at normal operating temperatureINotel During engine operation, carbon can build up on internal powerhead components, eventually causing piston rings to "stick Adding ONIC Carbon Guard fuel additive to every tank of fuel is your best protection against such buildup and the resulting mechanical problemsIf CMC Carbon Guard is not used consistently in the fuelONIC Engine Tuner should be applied every 50 operating hours13Check engine operation by verifying minimum test propeller RPM Refer to Engine Specifications, this section &