Wiseco Piston Kit 85.50mm 10:1 - Honda XR400R, TRX400EX, TRX400X (1996-2014)
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85.50mm bore, +0.50 over • 10:1 compression
Important: This is an oversize piston. Your cylinder must be bored to 85.50mm before it will fit. If your cylinder is still standard, order the standard bore version.
✓ Fits
- 1996-2004 Honda XR400R
- 1999-2008 Honda TRX400EX and TRX400EX Sportrax
- 2009 and 2012-2014 Honda TRX400X
- Stock bore and stroke 85 x 70mm • 397cc • 10:1 compression
- This listing is 85.50mm bore, +0.50 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
- 10:1 compression
- Uses circlip CW20
- Made in the USA
✓ What's Included
- Forged piston
- Piston rings
- Wrist pin
- Circlips
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📦 Shipping Information
In-stock items ship next business day. ModQuad parts dispatch Monday through Thursday.
Made-to-order and custom powder coat items show their lead time at the top of this page, right next to the truck icon. These are built fresh for you, so timing varies by brand and current backlog.
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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