Andy, I bought an f-20 about 30 years ago that did just about what your H is doing. It turned out to be the manifold had a rusted through between the intake and the exhaust inside the manifold below the exhaust pipe outlet. This was hard to find, it drove me nuts for a while. I did all the things you have done before I found the hole. After pulling the manifold off I could look into the intake and see clear through it and out the exhaust pipe. Hope this helps.
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Today's Featured Article - Tractor Traction - by Chris Pratt. Our first bout with traction problems came when cultivatin with our Massey-Harris Pony. Up till then, this tractor had been running a corn grinder and pulling a trailer. It had new unfilled rear tires and no wheel weights. The garden was already sprouting when we hooked up the mid-mount shovel cultivators to the Pony. The seed bed was soft enough that the rear end would spin and slowly work its way to the downhill side of the gardens slight incline. From this, we learned our lesson sinc
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