I bought a 1955 model 60 gas that had a very rough idle, but straightened right out under just a small load. I took it apart and discovered a broken ring had cut a sizeable groove lengthwise in the left cylinder. I sandblasted the block, head, and manifold and had the block bored .045". I put in new Aluminum pistons, did a valve job, and rebuilt the carb.I bought a shop manual from the local Deere dealer and reassembled the engine, torqued everything, set valve clearance, timing, carb adjustments, etc., by the book. I have also replaced the wiring, plugs, points, and lots of other things. After all this, the rough idle is still there, mayby even worse. Compression is equal on both cylinders and slightly higher than spec. This problem seems like a vacuum leak, but I can't find one. I am not sure if this is related, but when the tractor gets hot, gas comes out around the filler cap. Has anybody out there encountered this problem or have any idea what to do. I have tried everything I can think of.
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