I know just enough about snow machines to get me in trouble, so please forgive me if I sound clueless: I am. I bought a used 97 Indy trail with a 500 liquid cooled motor, and after a few hundred miles, I spun a connecting rod bearing on the crank. It was cheaper for me buy a used 440 liquid cooled here in town than to ship my crank off, have the bearings pressed on and off, buy all the replacement parts, etc. I finally got the motor back in, but it bogs down when you punch it. If you start slowly, the RPM's come up fine until just after the clutch engages, then it bogs down until it picks up some speed. After it finally gets going it tops out at about 55 MPH. If I'm in deep powder, forget it, I never get up enough speed; it just stays bogged down, even with it wide open. It's like I don't have any torque at the low/middle end of the power band. Do I need to make adjustments to my carbs to compensate for the smaller motor? Could this be a timing issue?