Wiseco 81.00 mm 639M08100 Piston

Classic Forged 2-stroke pistons are perfect for those looking to rebuild their 2-stroke engine with reliable, high-quality components. These pistons cover a wide range of Powersports rebuilds, including vintage motocross models, classic street bikes, and snowmobiles. The forged material improves tensile strength over cast pistons, ensuring refreshed performance on the track or the trail. 81.00 mm Bore

• Dedicated forgings and additional lightening operations allow for optimized strength-to-weight ratio
• Improved tensile strength of forged material optimizes strength and service life
• Designed and built for each specific 2-stroke powersports engine
• Includes high-quality piston ring(s), wrist pin(s), and circlips
• Engineered, forged, and machined in the USA in Mentor, OH

The Wiseco Classic Forged 2-Stroke Piston is designed for rebuilding compatible powersports engines. This piston features an 81.00 mm bore and is engineered for specific 2-stroke applications, including the listed Polaris Trail Boss 350L models. Its forged construction provides improved tensile strength compared with cast pistons, supporting service life and refreshed engine performance.

Dedicated forgings and additional lightening operations help optimize the piston’s strength-to-weight ratio. The piston includes high-quality piston ring(s), wrist pin(s), and circlips. It is engineered, forged, and machined in the USA in Mentor, Ohio.

Fitment includes the 1990–1993 Polaris Trail Boss 350L 2X4 and 4X4. Manufacturer part number: 639M08100. Vendor part number: 639M08100. Verify engine application and installation requirements before purchase.

Features:

• Bore: 81.00 mm
• Construction: Forged material with improved tensile strength compared with cast pistons
• Strength-to-weight ratio: Dedicated forgings and additional lightening operations
• Application: Designed and built for specific 2-stroke powersports engines
• Included components: Piston ring(s), wrist pin(s), and circlips
• Manufacturing: Engineered, forged, and machined in the USA in Mentor, Ohio
• Fitment: 1990–1993 Polaris Trail Boss 350L 2X4 and 4X4
• Brand: Wiseco
• Manufacturer part number: 639M08100
• Vendor part number: 639M08100

Air Freight Prohibited: false
Not Carb Approved: true
Carb Acknowledgement Required: true
Ltl Freight Required: false
Prop 65: Y
Part Type: powersports
Epa: N/A
Clearance Item: t
Regular Stock: false
Units Per Sku: 1
Fitment:
1990 Polaris Trail Boss 350L 2X4 Base
1990 Polaris Trail Boss 350L 4X4 Base
1991 Polaris Trail Boss 350L 2X4 Base
1991 Polaris Trail Boss 350L 4X4 Base
1992 Polaris Trail Boss 350L 2X4 Base
1992 Polaris Trail Boss 350L 4X4 Base
1993 Polaris Trail Boss 350L 2X4 Base
1993 Polaris Trail Boss 350L 4X4 Base