engine mod

[rooter4x4]

what is the best 300 kit for a 250x? is the cycle works racing kit any good and if so what does it include?

[bwamos]

You could go 74mm piston (stock dia.) +12.7mm stroker for max torque.

Or, 80-82mm piston w/ big bore sleeve and stock stroke (57.3mm) for peak HP.