I actually have the ARF version and I put in a 4-stroke OS .70 II Surpass. I was told if you put in a 4-stroke you will be using a longer prop and you will have clearance issues. So I put the [link=http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXNM65&P=ML]dubro landing gear[/link] on, great gear.

Manny