Re: Won’t idle
Posted: Tue Nov 29, 2022 6:56 pm
The carburetor is a M51L. When I bought the bike it had sat for years but did run but never properly. The engine had been rebuilt with very little use. The carburetor looked fresh also. Compression was fairly equal in both cylinders at 75psi. From my experience doing a test on a big twin with a kick starter is significantly lower than actual. Timing was checked static.
I cleaned and assembled a spare M51 today to try for a comparison. My understanding is the only difference is the venturi size. I did notice there’s a small passage that connects the low speed needle passage to the idle circuit passage. When I went through the 51L I don’t recall checking that passage. When I pull the 51L to try the 51 I’ll check it. I really think I have a carburetor problem and not ignition or compression. I just can’t understand why I can’t get the A/F right but persistence always prevails. Thanks for the help and any future suggestions.
I cleaned and assembled a spare M51 today to try for a comparison. My understanding is the only difference is the venturi size. I did notice there’s a small passage that connects the low speed needle passage to the idle circuit passage. When I went through the 51L I don’t recall checking that passage. When I pull the 51L to try the 51 I’ll check it. I really think I have a carburetor problem and not ignition or compression. I just can’t understand why I can’t get the A/F right but persistence always prevails. Thanks for the help and any future suggestions.