I don't think 80hp and 60ftlbs is out of reach with the 904, it's just a matter of cost. Go with a stage 2 head with +3mm oversize valves, cams, 12:1 comp pistons(or even 11:1) and some 42mm carbs with a remap of the ignitor and watch it go past 80 easy. The thing is, everyone has a different setup and a different budget. I doubt there is conclusive evidence of which exhaust pipe works best with the 904, too many variables. If I could have 65+ ftlbs of torque, I wouldn't care if I only had 70hp. If Bob is near 60ftlb at 5250rpm, then that sounds like it is a near perfect setup. The power is in these little motors, we just need to figure out how to get to it. I still want to get new cams in mine, but not to the point where I need to go shim-under bucket. Too costly. I feel like Fast Fred's carbs and intakes are a worthwhile purchase, way less than a new set of carbs for a good gain in hp and torque. If ProCom comes out with a new ignitor, then I will definitely get one and send it off for a remap. I don't want to put money in my stock unit when it could possibly fail. I also think my motor is already capable of reaching 80hp, but the rev limiter is preventing that. My torque is still climbing at redline, so the power is there to have, I just can't get at it yet. I would love to see someone go all out on one of these motors and post numbers. I'm still disappointed in the Wiseco pistons not being the claimed compression, that affects the torque directly.
