Dave Patrick ULtimate 1.20 Bipe engine????
I put a Saito 1.80 on mine. I too was trying to decide between the Saito and the OS 1.60 and the 1.80 won out mostly because I really like the sound and I can put a 3 blade 17/8 on it. It was a tough decision though, I love OS engines for their quality. Have an OS1.08 that ran like a swiss watch for 7 years and it's still good. I'm hoping I made the right choice.
BTW- my DP ultimate with the Saito (20 grams lighter than the 1.20) , hs5245's in the wings (1 oz each) and 16 oz tank, weighs 12 lbs dry. I don't know how it could possably weigh only the 10.5 advertised.