pathfinder813

thanks to both of you it really helping me

hello all i have recently bought an old tzr 125 and on my way to restoring it but i have hit a wall so to say i need to get the barrel rebored as there is blow back and carbon on the side of the piston this is the (wall) so to say do the tzr have a chrome bore or normal steel any help is much appreciated the bike is the 1990 model thanks