2000 Polaris Scrambler 400 2x4 is needing a new top end, looking at going with the 84mm/.040, this will be its first one done to it, will there be any other work needed, other than boring the cylinder????? (I don't mean with bad jokes,ha)[img]i/expressions/face-icon-small-happy.gif[/img]

 

If this is the first bore on te motor I wouldnt go any further than I had to.If .020 will get it that saves the cylinder for another bore.You could get it ported if not at least clean up the castings and polish the ports.

 

I agree go with .20 it is better in the long run, and yes clean that thing up. A good trail port will do wonders for that 400, get yourself a pipe and clutch kit and ride on