Ive been fooling around with this engine a bit

Its done about 2 gallons in a heli


and then about 1 gallon in a plane



and I put it back in a heli with the aeroplane head


and its not tuning all that good getting a little lean

Im getting a heli head ,

Looking at the cylinder wear


the ring is not touching the top of the bore in a couple of spots ,

that cylinder is not all that round

so its not really the head that is sending it lean


its the really non existant compression

What can I do


















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