I'm using a 120 OS pumped motor and my friend has a 150 saito wich balances perfect... Only problem I have is it needs tons of nose weight. Wish I would have went with the 150 rather have engine weight for balance then lead.

PS I wrote foam in wing in my other post ment wheel pants... I change it now. Remember when filling the wheel pants just add the foam slow an hold the edges of the pants to hold in place so they stay centered on the wheels. Remember the foam expands at least 1/4 - 1/2 of what you fill. I also taped the wheel pant tthe wing while doing this process...

Your motor should be fine.

Pic of my Kyosho Gee Bee