Wiseco Forged Piston Kit with Gaskets - Yamaha YZ250F / WR250F (2005-2013) - 77.00mm Bore - 13.5:1 - RACE ONLY - Nikasil - 4-Stroke

Wiseco Forged Piston Kit with Gaskets - Yamaha YZ250F / WR250F - RACE ONLY

Premium Wiseco forged piston kit with complete top-end gasket set for the Yamaha YZ250F and WR250F. This is a RACE ONLY piston with 13.5:1 compression featuring ArmorGlide® coating for maximum performance!

⚠️ RACE ONLY - Nikasil Cylinder Required

• RACE ONLY application - Not for street use
• Fits Nikasil bore cylinder only
• Dual ring design

Kit Includes

• Piston Kit #4881M07700
• Ring Set #7700YC
• Wrist Pin #S742
• Wrist Pin Retainer Set #CW16
• Gasket Kit #W5921

Key Features

• Forged Series design for maximum strength and durability
• 2618 aluminum alloy construction - preferred for high-performance racing
• ArmorGlide® skirt coating for reduced friction
• 13.5:1 compression ratio for race-level power
• Complete top-end gasket kit included
• Standard bore - direct replacement

Piston Specifications

• Bore Size: 77.00 mm (Standard)
• Piston Diameter: 76.95 mm
• Stroke Length: 53.60 mm
• Compression Ratio: 13.5:1
• Material: 2618 Aluminum Alloy
• Skirt Coating: ArmorGlide®
• Ring Design: Dual Ring

Engine Specifications

• Displacement: 250cc
• Engine Type: 4-Stroke
• Weight: 1.15 lbs

Fitment

• Yamaha YZ250F: 2005-2007
• Yamaha WR250F: 2005-2013