I have 2000 700 and i think i have tried it all but maybe some one has some ideas. i can get it to run pretty good on hard pack but once the motor has to work forget it, runs bad and bogs. even if i stop in the snow and try to get going again it will bog out and start billowing the smoke. I jetted it to the slp twin pipes that are on it with no help. Cleaned carbs 3 times, cleaned secondary, ran it without the accs system hooked up with a different air box. Did all my hood vent in a prefilter material to keep snow out, fabed up a deflector to keep snow away from the exhaust exit. nothing seames to help.