I just went through something similar on my340 U. it was driving me crazy! I had the carb on, off and apart so many times i can do it now blindfolded!!!
Through all the screwing around I discovered a leaking head gasket, so I decided to pull the whole thing down and fix it right. During disassembly, I was pulling the manifold off and discovered that ALL of the bolts were loose.. i barely nudged the ratchet to get them to turn. Even though I used either looking for a vacuum leak (to no avail) The gasket was shot and leaking...
Check your manifold fasteners.. Not saying that it's the problem, but I'm sure it was a big part of what was wrong on my tractor... And you can do it in minutes.
Good luck!
This post was edited by werksguy at 20:10:43 10/01/13.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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