1997-1998 Yamaha YZ 250 Piston Kit and Gasket set 

Mitaka top end kit consisting of:

Mitaka Piston Kit

Piston - High silicon cast aluminium alloy, CNC machined, Teflon coating in high friction areas.
Rings - Are manufactured by Riken, the OEM for many motocross bikes. Excellent quality and durability.
Gudgeon Pin - Hollow, forged, steel alloy, chromed, high strength and hardness. Circlips included.

This listing is for a B size piston kit (67.95mm - Standard Size) if you wish to change to an A size (67.94mm) C size (67.96mm) D size (67.97mm) oversize 68.50mm or 69.00mm please send a message when placing your order. 

Small End Bearing

Small end roller bearing with heavy duty roller cage designed for high RPM and durability.

Mitaka Gasket Set

Head gasket or O-rings, Base gasket, Exhaust valve gaskets, Exhaust pipe O-rings & various O-rings if required. All gaskets and rings that are needed for a piston change are included.

(Item may vary from picture, you will receive the item listed)

Mitaka components are engineered to OEM specifications or higher using the same manufacturing techniques and high quality materials.


Best MX Shop is based in Queensland, Australia offering parts and accessories for Motocross - Enduro - Supermoto bikes. For more products click the Visit Store link above this description or choose your brand to the left of this description. If you cannot find the item you need please get in touch.

This item is usually in stock and shipped within one working day from Queensland, Australia.

Free Post Australia Wide

Please ensure you know the correct year and model of bike before you order. If you are unsure please contact your local dealer with the frame number. If your local dealer is unable to help please send the frame numbers and pictures and we will attempt to find the details. If you order the wrong parts you will have to pay postage costs and a restocking fee upon exchange for the parts in original condition; However if we make a mistake we will cover postage costs and get the correct parts to you as quickly and smoothly as possible, or issue a full refund upon exchange for the parts in original condition.