Home › Forum › Ask A Member › 1972 Johnson 2hp – low speed and idle problem › Re: 1972 Johnson 2hp – low speed and idle problem
Just want to make sure I understand. You ran the engine before replacing the seals, and it did not idle correctly then either. Am I correct?
I have never done a compression test on one of these 2hps, but others have reported much higher compression readings, like 115PSI. Any signs of overheating? Have you had the cylinder head/exhaust cover off? Please don’t rip it apart based on my questioning though, hopefully the problem is a much simpler one like others have described.
I will just emphasize what others have said so far. Make sure the carb butterfly is closing fully, and the throttle shaft is not jammed/corroded. The only way to do this is to remove the carb and look at the butterfly while manually opening the butterfly slightly, then releasing it. The butterfly should snap closed on its own, without having to "help it". Have a look at the throttle plate as well, does it look like someone has been at the screw/removed it before?