thanks, that's what I was hoping to hear. we do plan on removing the fins and maybe see if we can balance the engine too. we know how to balance a multi-cylinder engine, we just need to find out if the same procedures aply to one cylinder engine or if the balance has to be different. not sure yet what hopups would work, the engine uses the piston for valving so I need to do my research before I try anything. at least get it running stock/balanced to at least have a base line to compare to. servos in the tail and maybe battery too should balance it. thanks.

Jason