Hello I have a 1972 25 hp johnson, that I bought in not running condition.
i cant beleive how light the motor is, will it really push out 25 hp?
Anyways, after spending time on the lower end, impeller, magneto, plugs wires and carb, the best I can get when I pull the cord is a few seconds of of really rough running. The adjustment needle on the carb has has been from one turn out to three turns out, no real difference it dies pretty quickly.
What I did notice the last time I worked on it, I can only pull the cord so many times, then I have to put it away, was that the choke was fluttering when the motor was running really rough.
The choke springs look fine and there doesnt appear to be a reason, for the choke to flutter.
I started the motor again, and used a screwdriver to keep the choke from fluttering.It was the first time the motor ran more than a few seconds, it ran long enough for the thermostat to kick in and have water come out of the pee hole which was nice to see.
the motor still ran rough, and when I opened the choke it still ran rough, but only for a few seconds.
I read another post and thought it might be the reed valves that are at fault.
I took the access cover off and the plate with the valves.
the reed valves look fine to me no discolouration, or grime and the fit is flush.
So the question is why wont the motor start or run properly?
Look forward to your response.