Salut! I want to know if any of you running thoses 444cc high comp. kit have any hp number to share with me. I'm racing on the ice and for 2002 they moved the four stroke limit from 426 to 450 in the 250 class. My 2000 was right on 54hp on a Dynojet 150, my 2001 was slightly down on that, even after quite a bit of fiddling and switching over to the 2000 ignition. The only thing done was oversizes valves and head porting plus a EVO pipe running on Pro Fuel MK IV (112 octane). I also run that same bike in 4 stroke open and the 600 class so I've got to hold my own against KX and CR (from 500 to 560cc) that crank out around 70 hp and there is also one guy running a 80 hp Rotax(at the front sprocket=72/74 at the wheel). I guess that I would do ok with around 60 hp with the wide and quick revvin powerband the YZ has and also with the traction advantage over the 2 smokes. Ciao!