Hi all! I just finished rebuilding a '57 Johnson 3 hp. Starts up fine and runs at higher speeds great after adjusting the high speed valve. But it just dies as soon as the lever is put left of START. I've played around with the low speed needle (starting at 1 1/2 turns off seated) without much progress. The engine will run at lower rpms if i play with the carb while on the start position, but sliding toward slow at all kills it no matter what.
Rpms do increase as i turn it in but as soon as i take the throttle down a little the engine cuts off at the same point every time. The carb has a whole new kit and has been disassembled and cleaned twice now. The low speed valve had an even taper but did look a little worn. (have one on order). Would this cause my problem? Or is it the jet? Carb cleaner flowed freely from the needle valve inlet to the little hole coming up from the float bowl.
Fuel was fresh, new plugs, wires, points (set .020), condensers, all new gaskets and deglazed cylinders with new rings. no fuel leaks around carb or anything like that.
Thanks to anyone who takes the time to respond.
Rpms do increase as i turn it in but as soon as i take the throttle down a little the engine cuts off at the same point every time. The carb has a whole new kit and has been disassembled and cleaned twice now. The low speed valve had an even taper but did look a little worn. (have one on order). Would this cause my problem? Or is it the jet? Carb cleaner flowed freely from the needle valve inlet to the little hole coming up from the float bowl.
Fuel was fresh, new plugs, wires, points (set .020), condensers, all new gaskets and deglazed cylinders with new rings. no fuel leaks around carb or anything like that.
Thanks to anyone who takes the time to respond.