4393M08200 Wiseco .040 Piston Kit for Honda TRX350 Foreman 1985-1989

Wiseco .040 Piston Kit for Honda TRX 350 Foreman

This Wiseco .040 oversized piston kit, cross-referencing part 4393M08200, replaces the stock piston in Honda TRX 350 Foreman engines to restore compression and performance after a top-end rebuild.

Overview

This Wiseco .040 piston kit for Honda TRX 350 Foreman models from 1985 through 1989 delivers the oversized bore and forged strength needed after cylinder wear or a top-end refresh. The kit pairs a .040 oversize piston with matching rings, wrist pin, and clips so the rebuild stays consistent. Built for riders and mechanics restoring these classic four-wheelers, the Wiseco piston kit 4393M08200 is a direct-fit replacement for tired stock components.

Built For Performance

• Forged piston construction for added strength over cast factory pistons
• .040 oversize bore restores compression after cylinder wear
• Complete kit with piston, rings, wrist pin, and retaining clips
• Cross-references Wiseco part 4393M08200
• Built to match the TRX 350 Foreman cylinder bore when honed to size

Fits These Machines

• for Honda TRX 350 Foreman 1985
• for Honda TRX 350 Foreman 1986
• for Honda TRX 350 Foreman 1987
• for Honda TRX 350 Foreman 1988
• for Honda TRX 350 Foreman 1989

On-The-Job Use

• Top-end rebuilds after piston scoring or loss of compression
• Bore-over service when the stock cylinder is honed past spec
• Restoring older Foreman quads for trail or farm duty
• Preventive rebuilds during engine teardown

Specs At A Glance

Good To Know

Q: Does this kit include everything for the top end? A: It includes the piston, rings, wrist pin, and clips, which covers the piston assembly itself, though gaskets and a bore/hone service may still be needed. Q: Will this fit a stock cylinder? A: This is a .040 oversize piston, so the cylinder must be bored and honed to match before installation.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.