Wiseco PK1867 Piston Kit with Top-End Gasket Kit 96mm 13:1 CR Honda CRF450R

The Wiseco PK1867 is a high-performance piston kit with top-end gasket kit engineered specifically for the Honda CRF450R (2009–2012). Built around the 4979M forged piston at a 96mm standard bore and aggressive 13:1 high-compression ratio, this kit is designed to deliver maximum power and durability in demanding dirt bike applications.

Wiseco pistons are forged and machined in the USA at their facility in Mentor, OH. By controlling every stage of production—from raw bar to finished component—Wiseco maintains the tightest manufacturing tolerances and highest quality standards in the industry. In-house dyno testing drives continuous development of advanced piston shapes, coatings, and technologies.

Key Features:

• 96mm standard bore forged piston — part number 4979M09600
• 13:1 high-compression ratio for maximum power output
• ArmorGlide coated skirt reduces friction and cylinder wall wear
• Dedicated forging optimizes strength-to-weight ratio for each specific engine
• Forged construction provides superior tensile strength, impact resistance, and fatigue life versus cast pistons
• Computer-engineered skirt profile minimizes cylinder wall friction
• Kit includes: forged piston, piston rings, wrist pin, and circlips
• Top-end gasket kit included for a complete service solution
• Engineered, forged, and machined in the USA

Wiseco's forged 4-stroke pistons are built to withstand the extreme heat, pressure, and mechanical stress of high-performance motocross racing. Unlike brittle cast pistons that can fail catastrophically under peak loads, forged pistons feature a condensed, aligned grain structure that delivers higher mechanical properties and reliable performance rebuild after rebuild.