I think there's nothing wrong with the engine...since it runs fine in one model (Cub) and poorly in the Cap....????

First off: The high tank position with the inverted engine. These two things in combination make for lousy bedfellows!

You likely don't see the problem on the ground, because the nose high attitude of the Cap when sitting...masks the tank position error.

You must correct the tank position or nothing will ever work.

Lastly...30% nitro seems to be absolute overkill in this engine.


'Race