Originally Posted by David John Davis

I wouldn't bother trying to convert a simple 46 two stroke engine.if I were you. What you save on the cost of fuel you lose on the cost of conversion and engines below about 20cc ( a120) don't seem to convert well.

You don't say what flying experience you have but if you've never flown a balsa and ply model please let a more experienced pilot fly the maiden flight for you. Better still, join a club if you're not already in one,