Wiseco SK1085 2-Stroke Pro-Lite Forged Piston Kit 68mm Standard Bore Arctic Cat 440

The Wiseco SK1085 is a complete 2-stroke top end piston kit engineered for Arctic Cat 440 snowmobile engines with a standard 68.00mm bore. Designed for Nikasil-bore cylinders and built around Wiseco's race-proven Pro-Lite forged piston series, this kit delivers the strength, precision, and reliability demanded by both competitive racers and serious recreational riders.

Each Wiseco piston is forged from high-silicon, low-expansion aerospace-grade aluminum alloy, offering a superior strength-to-weight ratio, improved heat transfer, and extended service life compared to cast alternatives. The pistons are CNC machined with an optimized cam shape and skirt profile engineered for peak horsepower output and consistent ring seal across the full rpm range.

Kit Contents:

• (2) Wiseco Pro-Lite forged pistons — Part #2332M06800 — 68.00mm bore, 436cc displacement, 60.00mm stroke
• (2) CD Series ring sets — Part #2677CD — Alloy steel, Ferrox-coated, chrome-plated, internally notched
• (2) 18mm unchromed alloy wrist pins — Part #S513
• (2) Round wire pin locks (circlips) — Part #CW18
• Top end gasket kit — Part #W5213

Key Specifications:

• Bore (Standard / Actual): 68.00mm
• Stroke: 60.00mm
• Displacement: 436cc
• Cylinders: 2
• Piston Series: Pro-Lite
• Ring Series: CD (Alloy steel, Ferrox-coated, chrome-plated)
• Wrist Pin: 18mm unchromed alloy
• Cylinder Type: Nikasil bore

Note: Top end bearings are not included and must be ordered separately (Wiseco Part #B1014 recommended — 18x23x22mm). This kit is sold by bore size; verify your standard bore dimension before ordering to ensure the correct fitment.