I can,t tell you right of the top of my head. The 478 and 549 are the same eng except in cu in but don,t know whether it is bor or stroke that changes it. I am thinking they ran diffrent cranks so the diffrence would be stroke. Go to your local NAPA store find the old counter guy that has been there 30 years they have a book that gives part numbers and what they fit can cross it all out. I am almost certain the farm tractor has a diffrent pin placement, would not work .
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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