Wiseco High-Performance Forged Piston Kit with Gaskets - Yamaha YZ250F (2008-2011) - 77.00mm Bore - 14.0:1 HIGH COMPRESSION
Wiseco High-Performance Forged Piston Kit with Gaskets - Yamaha YZ250F (2008-2011) - High Compression
Premium Wiseco forged piston kit with complete top-end gasket set for the 2008-2011 Yamaha YZ250F. This is the HIGH COMPRESSION version with 14.0:1 compression for maximum power! Features ArmorGlide® skirt coating for reduced friction and extended life.
⚠️ Important: Nikasil Cylinder
This piston kit fits Nikasil bore cylinders only. Verify your cylinder type before ordering.
⚡ High Compression: 14.0:1
This is a high compression piston (14.0:1) designed for riders who want maximum power. Requires premium fuel.
Kit Includes
- Wiseco Forged Piston (#4976M07700) - Premium 2618 aluminum alloy with ArmorGlide®
- Ring Set (#7700YC)
- Wrist Pin (#S742)
- Wrist Pin Retainer Set (#CW16)
- Top End Gasket Kit (#W5921)
Piston Specifications
- Bore Size: 77.00 mm (Standard)
- Piston Diameter: 76.95 mm
- Stroke Length: 53.60 mm
- Compression Ratio: 14.0:1 (HIGH COMPRESSION)
- Material: 2618 Aluminum Alloy
- Skirt Coating: ArmorGlide®
Fitment
- Yamaha YZ250F: 2008-2011
Standard vs High Compression
This is the HIGH COMPRESSION (14.0:1) kit. For stock compression, check out our standard kit (13.5:1, SKU 0903-0937).
📦 Shipping Information
In-Stock Items:
- Most parts ship next business day
- Modquad parts: Monday–Thursday dispatch
Made-to-Order Items:
- Custom swingarms & A-arms: 2–4 weeks
- EVP exhaust systems: 2–4 weeks
- Sneakers: 1–2 weeks
Stock Guarantee: Items marked "In Stock" ship immediately. Made-to-order items are built fresh for you.
Questions? Contact us—we respond within 24 hours.
