The ultimate YZ250/YZ250X Piston Kit 1999-2026

Ultimate Piston Kit for Yamaha YZ250/YZ250X (1999-2026)

The definitive piston upgrade for Yamaha's legendary 250cc two-stroke. Covers over 27 years of YZ250 and YZ250X production with proven performance.

• Key Features

• • Extended Coverage: 1999-2026 models
  • Performance Design: Enhanced power capability, single ring design for reduced friction, ring pin moved to 6 oclock/centered position to allow for improved porting for engine tuners.
  • Quality Construction: Forged from 4000 series aluminum for extreme durability, sized properly for the material and hard wide open usage. 
  • Complete Kit: Piston, ring, wrist pin, circlips.
  • Pro Supercross Proven: Last 250 two stroke in a premeir class main event was powered using this piston kit.
• The ultimate piston for demanding riders on the yz250
• We developed this piston over 15 years ago for our personal race builds - by moving the ring locating pin to the middle of the boost port  (like all good race engines now days), and going to a forged piston.  We had experienced a few OEM pistons failing in hard use, ripping wrist pins out of the piston, sometimes cracking the skirts, and ending in disaster, so we set out to develop the ultimate race piston.