Re: 1940-120-runs fine for a while , then sputters and quits

Posted by Dan Marrin On 2008/8/1 22:35:14

flackmaster:

Thank you for giving me so many areas to check. I have to agree about the location of the coil; on this 120 it is mounted right to the left side of the engine, just below the head with a pretty hefty bracket that must be fairy efficient at transferring a lot of engine heat to the coil. I did try disconnecting the coil from this mount and tying it to the horns, where it was well away from the engine and got the same sputtering result.

I don't believe my 120 has a heat shield above and forward of the fuel pump like my 1948's have, nor do I know whether they were ever outfitted with one.

I did check to see whether or not the damper valve in the exhaust manifold beneath the carb was moving freely and had a spring attached, but did not follow through by watching its performance in the warm-up process.

Again, you give me a lot of things to check up on.