WISECO 0910-0207 804M06850 High-Performance Piston Kit Piston Kit - 68.50 mm - Yamaha YZ250/YZ250X

Features

• Forged from high-silicon aluminum alloy for maximum strength and dependability
• Wiseco offers a complete range of popular piston models and years for both trail and racing applications
• Durability, longevity and increased horsepower
• Innovative forging design and piston skirt provide maximum horsepower and torque
• Features forged pistons, rings, wrist pins, and circlips
• These high-tech piston designs offer maximum compression ratios, ultra-stiff strutted forgings, and titanium nitride-coated rings, which all add up to more power that is sustained longer
• Each piston is E-Coated on the crown, ring grooves, and pin bore, for maximum wear resistance and protection from micro-welding, galling, and detonation
• GP Series parts generally have less machining on the outside, which helps seal up the bore for increased compression
• Additionally, boost ports are removed for a more predictable powerband and increased pull on the top end
• Cylinder sleeves must be purchased separately.
• Service intervals may be increased with Racer's Choice pistons over conventional Wiseco pistons, and are for expert racers and tuners only.

Specs

Piston Diameter	68.46 mm
Stroke Length	72,00 mm
Bore - Oversize	+2,10 mm
Piston Material	4032 Aluminum Alloy
Piston Material	Forged
Riding Style	Off-Road
Compression Ratio	Stock
Product Name	Piston Kit
Skirt Coating	Non-Coated
Stroke Length	72.00 mm
Bore - Oversize	+2.10 mm
Units	Kit
Bore Size	68.50 mm
Displacement	249 cc
Engine Type	2-Stroke
Model	Pro-Lite

Part Notes

• Ceramic composite bore cylinders will require sleeving or replating.

1999-2025	Yamaha	YZ 250
2016-2025	Yamaha	YZ 250 X
2022-2025	Yamaha	YZ 250 Monster Energy Racing

Fitment Disclosure

This quick reference fitment information is provided to direct you to our catalog information and the manufacturer's information. Consult manufacturer publication(s) and/or website(s) for specific fitment and application information and other important information. This fitment information is based upon the stock version of the motorcycle or unit referenced and any accessory added or other modification could invalidate the quick reference information provided.