WISECO Forged Piston for HONDA TRX 450 ES FOURTRAX FOREMAN 4WD, TRX 450 ES FOURTRAX FOREMAN ES 4WD 1998-2004

WISECO offers this piston kit for HONDA TRX 450 ES FOURTRAX FOREMAN 4WD, TRX 450 ES FOURTRAX FOREMAN ES 4WD, TRX 450 FE FOURTRAX FOREMAN ES 4WD, TRX 450 FM FOURTRAX FOREMAN S 4WD 1998-2004. The piston slides in the cylinder and takes the force of the air-fuel combustion, passing it to the connecting rod and crankshaft.

Why choose a forged piston?

Instead of simply being cast, a forged piston is hot-pressed under very high pressure and then machined: its metal is denser and free of air pockets.

• Stronger when hot: it copes better with high revs, overheating and detonation.
• Lighter for the same strength: less stress on the connecting rod and bearings.
• Good to know: depending on the alloy, it expands a little more and is fitted with more clearance; slight noise when cold is normal.
• Why does it cost more? Forging tools, full machining and surface treatments cost more than simple casting.

Why choose WISECO?

Wiseco has forged its pistons in Mentor (Ohio, USA) since 1941 and controls the whole process, from aluminium bar to the friction-reducing ArmorGlide skirt coating. Its pistons are developed with Team Honda HRC in Supercross (450 class since 2018).

When should you replace the piston on your HONDA TRX 450 ES FOURTRAX FOREMAN 4WD?

Harder starting, loss of power, blue smoke, oil consumption or a knock when cold: these are the signs of a tired top end.

No manufacturer hour figure for this model. Cross-Mania guideline: compression check every 50 h in hard use and every 100 h for leisure.

Specifications and fitting tips

• Material: Aluminium
• Piston compression: High compression
• Oversize Letter: A
• Manufacturer part number: W4825M09000

Cross-Mania tip: Measure the cylinder bore before ordering: the piston must match your cylinder size. Follow the manufacturer's break-in procedure and replace the top-end gaskets at the same time.

Also needed with this part

• 4-stroke engine oil : MOTUL 10W50 · LIQUI MOLY 10W40 1 L

Compatibility

Check the exact model and year of your bike in the list below before ordering.

Fits:
HONDA TRX 450 ES FOURTRAX FOREMAN 4WD 2001
HONDA TRX 450 ES FOURTRAX FOREMAN 4WD 2000
HONDA TRX 450 ES FOURTRAX FOREMAN 4WD 1999
HONDA TRX 450 ES FOURTRAX FOREMAN 4WD 1998
HONDA TRX 450 ES FOURTRAX FOREMAN ES 4WD 2001
HONDA TRX 450 ES FOURTRAX FOREMAN ES 4WD 2000
HONDA TRX 450 ES FOURTRAX FOREMAN ES 4WD 1999
HONDA TRX 450 ES FOURTRAX FOREMAN ES 4WD 1998
HONDA TRX 450 FE FOURTRAX FOREMAN ES 4WD 2004
HONDA TRX 450 FE FOURTRAX FOREMAN ES 4WD 2003
HONDA TRX 450 FE FOURTRAX FOREMAN ES 4WD 2002
HONDA TRX 450 FM FOURTRAX FOREMAN S 4WD 2004
HONDA TRX 450 FM FOURTRAX FOREMAN S 4WD 2003
HONDA TRX 450 FM FOURTRAX FOREMAN S 4WD 2002