GWARREN2,

I have the Saito 150 in mine and before it crashed it had so much power I was flying the plane around at less than 1/4 throttle. I never even went full throttle but I bet it would go verticle until it ran out of gas. The 150 is a very tight fit and you still have to dremmel out a lot for the throttle arm. Anything bigger and you might have to cut the cheeks off. I think the Saito 180 is an over kill and I'm not familiar with the gas engine and it's dimensions. Go with a 125 or 150 and you will have more than enough power.

JMHO,

Gibbs