Posted by kopeck on July 07, 2012 at 12:48:09 from (69.50.51.226):
My '47 A has been driving me nuts. For the last year or two it had a little miss in the idle doesn't matter the idle speed either. If you put it under a load, doesn't have to be to much, even just a small hill it cleans up.
I've rebuilt the carb and the magneto got a tune up (cap, rotor, wires and condenser).
at first I thought it could be the governor but if I don't see the rod moving at all unless it's at a very slow idle and the engine stumbles. I've even held the rod steady just to make sure. I was thinking an air leak might be doing it as well so I tried the propane test and didn't get anywhere.
Here's an A (not mine) that seems to have that same unevenness to it:
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