4825M09100 Wiseco .040 Piston Kit for Honda Foreman 450 S ES 1998-2004

.040 Piston Kit for Honda Foreman 450 S & ES

This .040 overbore piston kit for Honda Foreman 450 S and ES models from 1998 through 2004 (Wiseco 4825M09100) restores compression and brings fresh life to a worn top end.

Overview

This .040 piston kit for Honda Foreman 450 S and ES models from 1998 through 2004 gives your engine a fresh top end when the original bore is scored or worn past spec. The kit, referenced as 4825M09100, delivers the oversized piston and rings required to bring a tired cylinder back to working shape. It is intended for riders and mechanics rebuilding the 450cc Foreman for continued use.

Built For Performance

• .040 oversize bore increases cylinder volume to restore compression
• Piston kit matching the 4825M09100 part number for the 450 S and ES
• Rings and wrist pin included for a complete top-end rebuild
• Suited to 1998 through 2004 Foreman 450 engine cases
• Oversized construction requires a matching machine-shop cylinder hone or bore

Fits These Machines

• for Honda Foreman 450 S, 1998-2004
• for Honda Foreman 450 ES, 1998-2004

On-The-Job Use

• Freshening a smoking or low-compression Foreman 450 engine
• Top-end service on a machine used for farm or chores
• Rebuilds where the original bore is scored or out of spec
• Trail and hunting rigs needing reliable compression back

Specs At A Glance

Good To Know

Q: Do I need to machine the cylinder for a .040 oversize?

A: Yes, a .040 overbore piston requires the cylinder to be bored or honed to match. Confirm the finished bore and piston-to-wall clearance with your machine shop before assembly.

Q: Does the kit fit both the S and ES trim?

A: This kit is listed for the Foreman 450 S and ES from 1998 through 2004. Verify your machine's year and serial number before ordering.

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