Yamaha xt350 TT350 cylinder barrel and piston,cylinder bore looks to have been rebored and piston rings look unused ,piston also looks great n hardly used if not at all ,piston fits really nicely as if it's just been bored to suit but I have no history of this cylinder ,please satisfy your self that these parts are suitable and look at pictures as this forms part of the description ,please checkout my other xt350 tt350  listings + other trail bike items.