Evening all. I picked up a 1989 750 K non starter that had been laid up for some years. I found it had no spark which turned out to be the CDI unit. Replaced it and got her to start but she will only run on 3, pot 3 being the naughty one.
occasionally pot 3 comes in but it’s intermittent.
I see fuel coming out of the carb breather tube as a dribble.
she will start and run on choke but turn the throttle and she dies. Once warm on choke I can start her without choke but the throttle has to be wide open to get a start. I can keep her running if I good the throttle partially open but she does if I drop to idle speed.
I did a compression test but I’m not 100% happy with the fitting of the tester - the adapter kind of wobbles in the plug hole. Pots 1 2 and 4 give around 100psi pot 3 gives a very low PSI reading. I was kind of hoping that it was a tester issue or stuck valve that would free up with some running of the engine. I have not yet repeated the test since having run her up.
here is a video of her
https://youtu.be/R4TaK2QD5cw
I’ve taken the carbs off to clean them but would value some help on whether this could be a carb issue or something else.
thanks in advance