Wiseco SK1274 Top End Kit Polaris 440 Snowmobile Piston Kit 66mm

The Wiseco SK1274 is a forged top end kit designed for Polaris 440 snowmobile applications. This kit includes everything needed for a top end rebuild, featuring Wiseco's USA-forged piston (part 2401M06600) paired with 2598CD piston rings, engineered to deliver superior strength and durability over factory cast components.

Wiseco forges all of their own pistons in-house in the USA, using proprietary forge tooling developed and manufactured entirely within their own facility. This end-to-end control — from raw aluminum bar stock through finished skirt-coated parts — ensures consistent quality and performance that meets the demands of snocross and cross-country racing.

Key Features:

• USA-forged construction — condensed, aligned grain structure for higher mechanical properties and resistance to impact and fatigue
• Superior to cast pistons — forgings are tougher and more durable, resisting catastrophic failure under high stress
• Optimized strength-to-weight ratio — each forging is designed to maximize performance without unnecessary mass
• Skirt coating included — reduces friction and wear during break-in and extended use
• In-house R&D tested — developed using Wiseco's own dyno testing for proven real-world performance
• Complete top end kit — includes forged piston and ring set (2401M06600 + 2598CD)
• Designed specifically for Polaris 440 snowmobile engines

Wiseco's forged pistons feature condensed grain structure aligned to the geometry of the part, producing superior mechanical properties compared to brittle cast alternatives that can fail suddenly when yield strength is exceeded. This makes the SK1274 an ideal choice for high-performance and racing applications where reliability under extreme conditions is non-negotiable.