Wiseco PK1491 Pro-Lite 2-Stroke Piston Kit 90.50mm +1.50mm Oversize Honda CR500/CR480

The Wiseco PK1491 is a Pro-Lite forged 2-stroke piston kit designed for the Honda CR500R and CR480R, featuring a 90.50mm bore diameter at +1.50mm oversize and a 6.8:1 compression ratio. Engineered and forged in the USA, this kit delivers the strength, precision, and reliability demanded by serious off-road and motocross riders.

Kit Includes:

• Pro-Lite forged piston (90.50mm / +1.50mm oversize)
• High-performance piston ring(s)
• Alloy wrist pin
• Circlips

Key Features:

• USA-forged construction — engineered, forged, and machined in Mentor, OH for tight quality control from raw material to finished part
• Aerospace-grade aluminum alloy — provides superior tensile strength and an optimized strength-to-weight ratio compared to cast alternatives
• CNC machined Pro-Lite profile — cam shape and skirt profile are precision-machined for peak horsepower output and extended service life
• ArmorGlide skirt coating — reduces friction and wear for improved durability and performance under racing conditions
• Dedicated forging per application — each piston is designed specifically for the 2-stroke powersports engine it serves, not a generic blank
• Race-proven design — chosen by top race teams across Supercross, Motocross, GNCC, and more

Specifications:

• Bore Size: 90.50mm
• Oversize: +1.50mm (+0.060 in)
• Compression Ratio: 6.8:1
• Engine Type: 2-Stroke
• Piston Material: Forged Aluminum
• Skirt Coating: ArmorGlide
• Wiseco Piston Number: 871M09050

Note: Oversize pistons require cylinder sleeving and/or bore and re-nikasil treatment prior to installation. Wiseco size specifications reference the cylinder bore the piston is designed for, not the piston's measured diameter.