Re: 25HP JOHNSON TIMING SETTING'S
Mobiouss.... Your engine is a 1969 25hp Johnson.<br /><br />The timing of the engine is automatic and determined by the alignment of the crankshaft key with the slot in the flywheel. As long as the key is not sheared, the engine is in time.<br /><br />The points set to .020 on the high lobe of the cam. If the cam has a small section market set, have the fiber of the points aligned with that small section when setting the points.<br /><br />The spark plugs should be Champion J6C plugs set to .030 .<br /><br />The high speed jet is a brass fixed jet located in the bottom center of the float chamber. The adjustable needle valve at the top section of the carburetor is to be adjusted as follows:<br /><br />This is performed in neutral.<br /><br />Gently seat that slow speed needle valve, then back it out one and one half (1-1/2) turn. Start the engine and set the throttle to where the engine will just stay running (it's going to run lousy). In segments of 1/8 turn, start turning that s/s needle valve in. Wait for the engine to respond after each 1/8 turn. As the rpms increase (and they will), adjust the throttle again to where the engine just stays running. You will reach a point where the engine will either start to die out of it will "cough/spit back". At that point, back the needle valve out 1/4 turn. At some area in that 1/4 turn, you'll find the smoothest setting.
