Wiseco PK1440 Forged Piston Kit 69.00mm 10.5:1 CR Honda TRX250EX Sportrax

The Wiseco PK1440 is a complete forged piston kit designed for the Honda TRX250EX Sportrax, featuring a 69.00mm bore diameter (+0.50mm oversize) and a 10.5:1 compression ratio. This 4-stroke piston kit is engineered, forged, and machined entirely in the USA at Wiseco's facility in Mentor, OH, ensuring tight tolerances and consistent quality for every build.

What's Included:

• Forged aluminum piston
• High-performance piston rings
• Chrome-plated wrist pin with horizontal slot pin oiling
• Circlips
• Complete top-end gasket kit

Key Features:

• Dedicated aerospace-alloy forging — compressed grain structure improves tensile strength, impact resistance, and fatigue life compared to cast pistons
• Optimized strength-to-weight ratio — dedicated forgings allow precise material placement for maximum performance with minimal mass
• Dome design with improved flame travel — enhances combustion efficiency for peak power output
• Pressure seal groove — maximizes ring seal for improved compression retention
• Chrome-plated piston pin — reduces friction and extends service life
• Race-proven design — trusted by top race teams across Supercross, Motocross, GNCC, and more

Important Notes:

• Wiseco rings are not interchangeable between ring types — use only Wiseco rings with Wiseco pistons
• Cylinder sleeve must be purchased separately
• This piston is +0.50mm oversize (69.00mm); ensure cylinder is bored/honed to match

The Wiseco PK1440 piston kit gives you everything needed to complete a top-end rebuild in one package. Built to exceed OEM standards, this kit is the go-to choice for riders seeking improved performance and long-term durability from their Honda TRX250EX or TRX250X engine.