i just got another kx250, love the kawasaki's. i have to rebuild the bike since someone ran it with little or no premix. not sure tho, but the crank and rod bearing is garbage. heres my question, i put the piston on the bore, ran it to the top of the cylinder. i noticed the skirt covers half or a little more of the front transfer ports. will it do me any good to shave the piston skirt to open up the ports?