ORIGINAL: cubfloater
Don't mean to disagree with Dauntae but I put a Saito 72 on mine and it flew great. Of course it came out light (7 lbs even) and I don't wring it out. But it did take off at 1/2 to 3/4 throttle. When reading a thread while building I was worried about the weight so I applied liberal sand paper and also got it balanced without weight. Of course I wouldn't want any less power and don't know about the 65. If it's older and not as much power as a newer engine it could fly it but might be borderline.
7 lbs even.. WOW that is impressive building, If you manage to get it that light a 70 would fly it fine, However you will get some variance in the kit itself too. When I was building, I did it with a friend and we built both together at his house, and there where definitely some wood heavier in one kit to the other. cubfloater must have gotten some of the lighter wood, and with his building light added has a much lighter plane. (your making us jealous here cubfloater) But I do agree the older 65 is lower on power than some of the newer designed engines.
Dauntae