- Jan 31, 2007
i just got a 1992 rm 250 and it clattered bad so i pulled the the top end off and the piston has a bunch of pits in it and the top ring was seized and the cylinder head has pits in it to..the cylinder is scored but no deep scores just visible scratches...can the cylinder be honed? and it has a rod in it that says pro series has anybody ever heard of these are they any good? and the rod has side to side play but only a teeeeeeeeny bit of up and down play is it ok? oh and how do u know if the crank bearings are ok?