Piston Kit 1.50mm Oversize 86.50mm Bore Compatible with 1999-2008 Honda TRX400EX Sportrax 400 XR400R TRX400X 397cc Air-Cooled SOHC Single Cylinder Rings Pin 13101-KCY-670

Piston Kit 1.50mm Oversize Compatible with 1996-2014 Honda XR400R TRX400EX Sportrax 400 TRX400X 397cc Air-Cooled SOHC 4-Valve Single Cylinder (86.50mm Bore)
Direct replacement 1.50mm oversize piston kit for Honda XR400R (1996-2004), TRX400EX Sportrax 400 (1999-2008), and TRX400X (2009-2014) with 86.50mm bore. Requires cylinder boring from 85.00mm standard to 86.50mm. Kit includes cast aluminum piston with MOS2 coating, piston rings, wrist pin, and circlip retainers for a complete single-cylinder rebuild.

OEM CROSS-REFERENCE PART NUMBERS:
• 13101-KCY-670 (standard piston)
• 13102-KCY-670 (0.25mm OS)
• 13103-KCY-670 (0.50mm OS)
• 13104-KCY-670 (0.75mm OS)
• 13105-KCY-670 (1.00mm OS)
• 13011-KCY-670 (ring set)
• 13111-KCY-670 (piston pin)
• 12100-KCY-670 (cylinder)

SPECIFICATIONS:
• Type: Piston Kit with Rings
• Size: 1.50mm Oversize
• Bore: 86.50mm
• Standard Bore: 85.00mm (3.346")
• Bore x Stroke: 85.0mm x 70.0mm
• Displacement: 397cc
• Compression: 9.1:1
• Cylinders: Single Cylinder
• Engine Type: Air-Cooled 4-Stroke SOHC 4-Valve
• Kit Contents: Piston, Rings, Wrist Pin, Circlip Retainers
• Material: Cast Aluminum with MOS2 Coating

APPLICATIONS:
• Honda XR400R (1996-2004)
• Honda TRX400EX Sportrax 400 (1999-2008)
• Honda TRX400X (2009-2014)

⚠️ Verify OEM part number from your original engine before ordering.