Hi, im looking for some engine mods for my wolverine. im thinking of a cam, valvespring and a high compression piston. But i dont want to take away from its relability. also I probalaly wont do the work myself and it wont be till later this summer.anyone have any problems with new parts? and is it expensive to get them installed. what type of piston, cam and spring are best?and were can i get them? thanks