Wiseco 4606M08800 Forged Piston Kit Honda XR/TRX400EX/TRX400X 88mm 10:1 CR 3.00mm Oversize

The Wiseco 4606M08800 is a complete forged piston kit designed for Honda XR400R and TRX400EX/TRX400X engines. This kit provides a 3.00mm oversize bore of 88.00mm with a 10:1 compression ratio, making it an ideal choice for top-end rebuilds and performance upgrades on worn or bored cylinders.

Forged from high-silicon, low-expansion aerospace aluminum alloy, this piston delivers superior strength, reduced weight, improved heat transfer, and extended service life compared to cast alternatives. Unlike cast pistons, Wiseco forgings feature a condensed, aligned grain structure that produces higher mechanical properties and outstanding resistance to impact and fatigue — critical advantages under the demands of high-performance ATV and off-road riding.

Key Features:

• 88.00mm bore — 3.00mm (.120") oversize for use with a bored or sleeved cylinder
• 10:1 compression ratio for strong mid-to-top-end power
• 70.00mm stroke compatibility
• Floating wrist pin design for smooth, reliable operation
• Forged from aerospace-grade aluminum alloy for strength-to-weight optimization
• CNC diamond-turned finish for precise sizing and consistency
• All forging and machining performed in the USA
• Full quality control from raw material through skirt coating

Kit Includes:

• One (1) forged piston
• Piston ring set
• Wrist pin (piston pin)
• Wrist pin circlips (retaining clips)

This kit is engineered specifically for Honda XR/TRX400 platform engines. Note that oversize pistons require a properly bored or re-sleeved cylinder. Cross-reference: Wiseco 4606P12.