[MV] M38 Carburetor acting up

Sun, 7 Dec 1997 11:55:55 -0500 (EST)

Hello mobile OD fanatics!

I've finally solved the fuel supply problems with my '51 M38 (complete line
replacement, fuel pump cleanout, and fuel tank cleaning/sealing) so now I can
actually drive away from home without fear of getting stranded, but this
brings me back to my original problem with the carburetor.

I am not very familiar with the inner workings of *any* carburetor, and this
one (Carter YS) should be simple, I guess, but, sorry, I'm stuck...

About half the time the carb works well, with the mixture adjustment behaving
normally. The rest of the time the engine goes into a strange mode - the
mixture seems to have jumped way richer, with gas smell in the exhaust, a bit
of smoke, rough idle, etc. When it is in this "mode", the mixture adjustment
screw has absolutely no effect! Crank it all the way in, crank it all the
way out, no difference.

It seems like fuel is bypassing the normal, metered path -- but I don't know
enough to troubleshoot further. I ordered a carburetor overhaul kit last
night (maybe that will provide some answers), but meanwhile can anyone help
me understand what might be going on?


Steve Johnston


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