big bore cylinder barrel kit aprilia rs50 rs 50 1993 2005 Yamaha YZ426 Yamaha XZ 550 (UK Model)

Yamaha XZ 550 (UK Model) (1982-1984)

Please note these will not fit the Suzuki GSX400 FWS models with the GK71A engine

Honda XR 200 R (1980-1982)

Honda XR 600 R (1988-1990)

choke cable

big bore cylinder barrel kit aprilia rs50 rs 50 1993 2005 Yamaha YZ426 Yamaha XZ 550 (UK Model)Brand new big bore cylinder barrel kit to fit: Aprilia RS 50 (1993 2005). This cylinder kit has been manufactured to replace the original top end on an Aprilia RS50 for the years and models shown above. The kit includes: cylinder barrel jug head piston kit gaskets To upgrade the original from 50cc to 70cc. 47mm bore. To replace OEM: AP8206375. CHASSIS NUMBER PREFIX: 070,085,ZD4MM.