Motorcycle Piston Rings For Yamaha TT-R250 1999-2006 Work for Fit For Yamaha TTR250 TT-R250 1999-2006 motorcycle 73mm bore cylinder overhaul assembly Align cylinder inner wall matching structure; support direct replacement without or auxiliary fittings cylinder compression; cut oil consumption power loss during offroad trail riding Adopt machined piston rings with smooth surface; create tight uniform contact with cylinder wall Made to standard 73mm bore specs; fit cylinder inner space to eliminate assembly clearance gaps