So I just bought a 1991 250x with a somke problem for cheap. I figured it was the rings, not to terrible fix, right? So I ripped it apart, and found metal shavings in the screen in the bottom of hte engine. I looked, And the cam has flat spots on it. I figure while Im replacing it, upgrade it. What cam should I get? When I replace the piston and rings, Should I raise the compression? Will the enging be able to keep itself cool enough?