Wiseco SK1212 2-Stroke Top End Piston Kit 72.50mm 0.50mm Oversize Ski-Doo 537 Pro-Lite

The Wiseco SK1212 is a complete Pro-Lite forged top end kit engineered for 1986–1988 Ski-Doo snowmobiles equipped with the Rotax 537 engine. Designed for riders who demand both reliability and performance on trail and track, this kit delivers everything needed for an oversize top end rebuild in one package.

Kit Includes:

• Forged Pro-Lite pistons (quantity: 2)
• Piston rings
• Wrist pins
• Circlips
• Top end gasket set

Specifications:

• Bore – Actual: 72.50mm
• Bore – Standard: 72.00mm
• Oversize: +0.50mm
• Stroke: 64.00mm
• Displacement: 528cc
• Cylinders: 2
• Engine Type: 537 (Rotax)
• Bore Type: Cast Iron Bore
• Cross-Reference: 2373M07250, 2854LK

Part of Wiseco's Pro-Lite series — the brand's staple forged 2-stroke snowmobile piston line — the SK1212 features an optimized forging profile for superior strength-to-weight ratio and lightweight material removal for enhanced throttle response. Unlike cast pistons, Wiseco's forged construction produces a condensed, aligned grain structure that resists impact and fatigue under demanding conditions.

All Wiseco pistons are forged in-house in the USA using proprietary tooling, allowing complete control over the manufacturing process from raw material to finished skirt-coated parts. Rigorous in-house dyno testing ensures each piston meets exacting performance standards before it leaves the facility.