Wiseco Forged Series Piston Kit with Gaskets - Honda TRX400EX/TRX400X/XR400R (1996-2014) - 85.50mm Bore (+0.50mm Oversize) - 10.0:1 Compression - 4-Stroke
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Wiseco Forged Series Piston Kit with Gaskets - Honda 400 Platform - +0.50mm Oversize 10.0:1
Premium Wiseco Forged Series piston kit for Honda TRX400EX, TRX400X, and XR400R. +0.50mm OVERSIZE (85.50mm) with 10.0:1 STOCK compression!
⚠️ Oversize Piston - Cylinder Boring Required
This piston is +0.50mm oversize. Cylinder boring to 85.50mm is required for proper fit.
Kit Includes
- Forged Series Piston
- Ring Set
- Wrist Pin
- Wrist Pin Retainer Set
- Complete Gasket Kit
Key Features
- 10.0:1 Stock Compression - OEM-equivalent performance
- Standard bore - no additional modifications needed beyond boring
Piston Specifications
- Bore Size: 85.50 mm (+0.50mm Oversize)
- Piston Diameter: 85.45 mm
- Stroke Length: 70.00 mm
- Compression Ratio: 10.0:1 (Stock)
- Material: 2618 Aluminum Alloy
- Skirt Coating: Non-Coated
Engine Specifications
- Displacement: 397cc
- Engine Type: 4-Stroke
- Weight: 1.95 lbs
Fitment
- Honda TRX400X: 2009, 2012-2014
- Honda TRX400EX Sportrax: 2000-2008
- Honda TRX400EX FourTrax: 1999
- Honda XR400R: 1996-2004
📦 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.
Questions? Contact us, we respond within 24 hours.
