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Wiseco 639M08050 80.50mm 2-Stroke ATV Piston Kit with Rings and Circlips

(1990-1993 Polaris Trail Boss 350L 2x4; 1990-1993 Polaris Trail Boss 350L 4x4)

Manufacturer

Picture for manufacturer Wiseco Pistons

Part Number

639M08050
14 reviews
Sale Price

$179.99

Estimated ship date Friday, November 20

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Product Details

The Wiseco 639M08050 is a high-performance 2-stroke ATV piston measuring 80.50mm bore diameter, offering a +0.020" oversize for engine rebuilds requiring a slight bore correction. Wiseco pistons are manufactured to OEM-exceeding standards using forged aluminum construction, delivering superior strength, reduced weight, and improved thermal management over cast alternatives.

Key Features:

  • 80.50mm bore diameter — +0.020" oversize (0.50mm over standard)
  • Designed for 2-stroke ATV engines
  • Forged aluminum construction for superior strength and heat dissipation
  • Precision-machined to tight tolerances for optimal ring seal and performance
  • Suitable for high-RPM, high-performance applications

Kit Includes:

  • Piston
  • Piston rings
  • Circlips
  • Note: Wrist pin is not included unless specifically noted. Only genuine Wiseco replacement ring sets are compatible with Wiseco pistons.

Wiseco has been a trusted name in powersports engine components for decades, supplying performance and replacement pistons to ATV, motocross, and off-road enthusiasts worldwide. The 639M08050 is an ideal choice for engine rebuilds requiring precise oversize fitment in compatible 2-stroke ATV applications.

Products specifications

Fits

1990-1993 Polaris Trail Boss 350L 2x4; 1990-1993 Polaris Trail Boss 350L 4x4

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Good, lower price.

Fast and easy, love the feature that allowed me to pay with Amazon. Thanks!

The order number 15547 tailgate lock fit perfectly. The shipping was very fast, ordered on Tuesday, delivered on Saturday. Will order from again.

Great products, great prices, excellent communication!

Cheapest around, excellent shipping, easy to use website! ill be back!!!

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