Should be more than a stock bike, which was right around 60hp. I need to see what it does, anyway. I need more jets, before I start, so I can run the jetting up and see how it does.
Screwy thing about a dyno, and tuning a 2-stroke - you don't tune based on A/fr. The smoke in a 2-stroke will screw up and air/fuel ratio monitor pretty bad. You just have to tune to the jetting changes. Run it, check numbers, change a jet and run it again against the numbers. You'll only be able to change one jet at a time and watch progress, until it starts coming back down again. Then you know where the power mark was and what jet that was. I always tune a 2-stroke with 15% brake on the drum, to simulate the load on the engine in sand.
Here's what I did on my first-overbore (66.25mm piston) on the 250 2-stroke quad:
Here was the tuning I did on the M109, after pulling the secondary throttle plates - Initially, with the secondaries out, when you'd mash it, it would shoot to over 18:1 A/fr. Not good. Tuned it in to pull a consistant 12.75:1 A/fr, just going a little lean at redline...
I really like that bike - over 100 lb/ft of torque from 2,250 RPM all the way to redline... >:D :hethan: