Wiseco PK1029 Forged Piston Kit Compression Honda - 4-Stroke 75.5mm 11 1 TRX300EX

The Wiseco PK1029 is a 4-stroke forged piston kit designed for the Honda TRX300EX Sportrax ATV. Featuring a 75.50mm bore (1.50mm oversize) and an 11.0:1 compression ratio, this kit is built for riders who demand reliable performance and durability from their top-end rebuild.

Kit Includes:

• Forged aluminum piston (4574M series)
• Precision piston rings for maximum compression and oil control
• Chrome-plated wrist pin with horizontal slot oiling
• Circlips for secure pin retention
• Top-end gasket kit

Key Features:

• Forged in the USA — engineered, forged, and machined in Mentor, OH for superior quality control from raw material to finished part
• Aerospace-grade aluminum alloy — dedicated forging optimizes the strength-to-weight ratio for high-performance ATV applications
• ArmorGlide skirt coating — reduces friction and minimizes wear for longer service life
• Race-ready dome finish — smooth edges promote improved combustion flow and flame travel
• Pressure seal groove — ensures maximum ring seal and compression retention
• 4-valve cylinder head compatible — designed specifically for the TRX300EX engine platform

Wiseco's forged pistons outperform cast alternatives by featuring a condensed, aligned grain structure that delivers greater resistance to impact, fatigue, and heat. Cylinder boring to 75.50mm is required before installation. This kit covers a single cylinder.