Not many Super H tractors still running with original pistons so hard telling what is in there. If it has fire crater and you have original distributor your advance will be way too much. Timing with a light , you have to know what you are looking for. Almost all distributors on those tractors will start to advance at very low engine speeds and that is why you set timing at full throttle at max advance and then observe where it is at mid and slow speeds. If it is over advancing at low speeds you will have a rough running engine. If you have a rain cap on it the thing will slap back and forth and it should not do that if correct. I often just static time them because I am familiar with how a good distributor feels and good running engine sounds. If not, then you have to go farther in you checking and adjustments. Standard advance is 30 degrees btdc and fire crater is 22 degrees btdc at full throttle. The springs they use on fire crater are very weak and often over advance at low speeds. Far as carburetor, it could be anything. Might not even be correct one, wrong venturi, wrong main jet, wrong nozzle, wrong idle jet or damaged idle jet. If your guy checks it all assembled on a dyno you should be in good shape though.
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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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