LA Lunging

46chief1 · Oct 20, 2017

Need a little help. I just finished restoring a 1942 LA and everything went well but I had the timing off and it would not start. I re-timed it as per yesterday tractor and it will run but the engin lunges and it is struggling. I know tha carb is ok so could the timing still be off enough to cause this. Help would be appreciated. Thanks

Bob · Oct 20, 2017

NOT quite sure what you mean by "lunging", I'm guessing "surging", which IS likely a carburetor issue.

There's an idle circuit and a load circuit in the carb, and if all is not as it should be, the "transfer" of fuel flow from "idle" to "load" and back will not be smooth and that causes surging. Minor adjustments may help, or there may be passages and/or drillings into the bore where the idle mixture enters near the edge of the closed throttle plate that are clogged.

Hotflashjr · Oct 20, 2017

Have you adjust your carb to governor rod per the owners manual? Just another easy thing to verify.

My LA had a carb to gov rod that was bent. I was really new to the LA and tractors then and just didn't know. It gave me fits for a while running rough and surging. Bought one from Ridenours, installed per owners manual and away I went.

Mike M · Oct 20, 2017

I don't think it will cause that problem, but if you have not installed the air cleaner yet that does effect the way they run at least under load. I found that out on one I swapped engines in.

LA Lunging

46chief1

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Bob

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Hotflashjr

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Mike M

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