Ive got an H and it would fall on its face too even with high domed pistons. My first step was the governor. I had a friend help me make a good governor out of 3 junk ones. We replaced the bearings and seals and used the weights that were the least sloppy. That helped an immense amount. I still did not have the power to pull it even in low gear once we got up to about 190%. I talked to some people and the said that I probably had the old all fuels (distillate) head. The head has a lot bigger combustion chamber. I bought a 300 head and had it milled .110" and it made a world of difference. I cac go up to 190% in second gear before dropping. In your case I believe you could go with either a 400 or a 450 head.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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