I have the 10:1 (or is it 10.5:1) Wiseco pistons in my Nikasil barrels. For the same price I could have gotten 11.5:1 pistons but I opted for the standard Wiseco. I use mid grade which has always been fine. If you go up on compression, you might need to try premium.
My goal was to maximize the torque I could get out of the bike from 2500 to 5500 rpm. I didn't really care what the Hp was at 7500. On my current set up I'm getting a max. of 65.54 ft. lbs. at 3408 and almost 75 Hp at redline, but the two cross (5250 rpm) at 59.3. Needless to say I'm very happy.
I also tried a lighter flywheel. It added some top end Hp but lost some torque in the lower rpm range. I had the stock one put back on. Torque is one of the greatest gains with the BB and makes the cost well worth it.
