NOS OEM Yamaha Single Ring Piston for the 1969 to 1971 AT1 125MX machines.   .50  (Second over) bore size. These are 40-50 year old parts and may have stains or discoloration from years of storage and handling but are 100% mechanical condition. 

Shipping is FREE in the lower 48 states. International buyers are welcome but PLEASE email me BEFORE buying to get an accurate shipping quote.

I do combine shipping on multiple purchase items.

PLEASE ask any questions BEFORE buying. 

Thank you for looking at my items!