Wiseco 577M08100 ATV Piston Kit .040 Oversize 81mm Bore

The Wiseco 577M08100 is a high-performance forged piston kit designed for Honda FL400R Pilot ATVs (1989-1991). This .040 oversize piston features an 81mm bore, providing 1.00mm oversize from the standard 80mm bore for rebuilding worn cylinders.

Premium Forged Construction:

Wiseco pistons are made from forged aluminum alloy for lighter weight and higher RPMs. Extreme racing conditions demand the strength and toughness that only forged pistons can offer, as forgings are tougher and more durable compared to cast pistons. The forging process creates a condensed grain structure that provides superior impact and fatigue resistance.

Key Features:

• Dedicated forging provides light weight and superior strength
• Dome design for improved flame travel
• Skirt coated with Armor Glide for reduced friction and scuff resistance
• Horizontal slot pin oiling reduces friction
• Pressure seal groove provides maximum ring seal
• Lightweight forging for instant throttle response and computer-engineered piston skirt profiles provide minimal cylinder wall friction

Complete Kit Includes:

This piston kit includes 1 piston, 1 ring set, 1 wrist pin, and 1 circlip set. The kit includes a chrome plated piston pin and dedicated rings for maximum compression and oil control. Only Wiseco replacement ring sets can be used on Wiseco pistons.

Installation Note:

Send your cylinder to a machine shop for boring and honing to fit this oversized piston. This oversize piston is designed for cylinders that have been worn beyond standard tolerances and require reboring.