Wiseco Piston Kit 89.00mm 11:1 - Honda XR400R, TRX400EX, TRX400X (1996-2014) (SLEEVE NOT INCLUDED)
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READ BEFORE ORDERING: SLEEVE NOT INCLUDED. This 440 big bore piston will not fit a stock cylinder. Your cylinder must be sleeved and bored before this piston can be installed. The required 88mm sleeve is Parts Unlimited part number 0931-0054 and is sold separately. Do not order this piston unless your cylinder is already sleeved or you are having that work done.
89.00mm bore, +4.00 over • 11:1 compression
✓ Fits
- 1996-2004 Honda XR400R
- 1999-2008 Honda TRX400EX and TRX400EX Sportrax
- 2009 and 2012-2014 Honda TRX400X
- 440cc big bore • 89 x 70mm • 11:1 compression
- This listing is 89.00mm bore, +4.00 over
✓ Features
- Forged from high-silicon aluminum alloy, not cast, for maximum strength and dependability
- Forging design and skirt profile shaped to deliver horsepower and torque across the range
- Handles heat and detonation far better than the original cast piston
- Better heat transfer out of the crown means longer service life under sustained load
- CNC machined for consistent sizing with no variation part to part
- 11:1 compression
- Uses circlip CW20
- Made in the USA
✓ What's Included
- Forged piston
- Piston rings
- Wrist pin
- Circlips
✓ What's NOT Included
- Cylinder sleeve (order 0931-0054 separately)
- Machine work to sleeve and bore the cylinder
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📦 Shipping Information
In-stock items ship next business day. ModQuad parts dispatch Monday through Thursday.
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Need something by a specific date? Call us at 541-668-7503 before ordering and we will check stock and ETA on that exact part. We can often point you to an in-stock alternative from another distributor.
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