Random backfiring can also be caused by lean mixture which can be caused by restricted fuel flow from tank , restrictions in fuel passages in carb, air leaks in carb/manifold/gaskets.Also fouled spark plugs will do it. Double check your work on the mechanicals but you may very well have them correct. Unless someone has changed timing since it ran good , it probably is still on. Tell us how and when and how often it backfires because it makes a difference. In 2 cyl JD,s the "keep it simple" method usually cures 90% of their running problems.
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Today's Featured Article - Restoration Story: 1951 Farmall H - by The Red (John Fritz). I have been a collector of Farmall tractors since 1990 when I first obtained part of the family farm in Eastern Indiana. My current collection includes a 1938 F20, 1945 H, 1946 H, and the recently purchased 1951 H. This article will focus on what I encountered and what I did to bring the 1951 NEAR DEATH Farmall H back to life.
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