Wiseco SK1233 2-Stroke Top End Kit 77.00mm 1.00mm Oversize for Ski-Doo 583

The Wiseco SK1233 is a complete 2-stroke top end kit engineered for Ski-Doo 583cc liquid-cooled snowmobile engines. Sized at 77.00mm bore (1.00mm oversize), this kit contains everything needed to properly overbore or rebuild the top end in a single purchase — forged pistons, rings, wrist pins, circlips, and a top end gasket set.

At the heart of this kit is Wiseco's Pro-Lite forged piston, CNC machined to an optimal cam shape and profile for peak horsepower and extended service life. The piston features Wiseco's ArmorGlide skirt coating for reduced friction and improved scuff resistance, and is precision-matched and balanced for cast iron bore cylinders. A horizontal slot-pin oiling design reduces friction while a pressure seal groove ensures maximum ring seal.

Key Features:

• Bore: 77.00mm — 1.00mm oversize
• Pro-Lite forged piston design with ArmorGlide skirt coating
• CNC machined for optimal cam shape and peak HP
• Designed for cast iron bore cylinders
• Horizontal slot-pin oiling for friction reduction and scuff resistance
• Precision-matched and balanced piston set
• Includes: forged pistons, rings, wrist pins, circlips, and top end gasket set
• All pistons forged and precision-crafted in the USA

Wiseco's forged pistons are built from high-silicon, low-expansion aluminum alloy, delivering superior strength, reduced weight, improved heat transfer, and longer service life compared to cast alternatives. Unlike cast pistons which can fail catastrophically under stress, Wiseco forgings feature condensed, aligned grain structure for higher mechanical properties and superior resistance to impact and fatigue — exactly what demanding snowmobile racing and hard riding conditions require.

Cross-reference part numbers: 2376M07700, 3032LT.