Ok, nothing is wrong with my cylinder or piston, I took it right down and the piston only has a little bit of wear like one line, found this one for the sms so smaller powervalves so will fit mine, but seller said it will run but maybe need a replate. From the pics it doesnt look too bad, I will try a scotchbrite pad on it at first, if it still isn't smooth shall I just get my garage to hone it a bit? I've got a 53.96 mm piston ready, that's size c, standard is a or 53.94mm, say garage hones it then measures the bore, if cylinder is too tight for that piston can the barrel be bored out enough that the ''c'' piston will work in it? It's nikasil coated. I am stupid I know I bought the piston before measuring as I recalled the piston I took out originally was a size C so I assumed the current one would be, and it's a B 53.95mm [but that's the one on the bike atm]


