Posted by machinery-man on December 26, 2012 at 08:59:55 from (22.214.171.124):
In Reply to: JOHN DEERE 620 posted by mkr100 on December 25, 2012 at 19:54:24:
JD makes hi altitude pistons in oversize but I dont" know if they made in .125 Extra or excess compression can also be a problem as your carb will have to be calibrated accordingly and your iqnition will be critical. Personally I think it will mess up your burn time on regular fuel. Now if you going exotic fuel, nitro or alcohol I don"t have a clue. I once used Hi altitude pistons in a 520 and couldn"t stand how it ran, way way too much compression and it didn"t run as good as standards that I reinstalled. Cam timing etc is also a factor. Hopping up a 2 cylinder is over my paygrade but there might be pullers that can offer you the right combination, not sure they"re on this site. Good luck.
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