Polaris Sportsman 90 Piston Set - Wiseco - 10.5:1 CR, 47.50 mm Bore - `07-`14 is a complete forged piston kit built to replace or upgrade the factory pistons in Outlaw and Sportsman 90 models from 2007–2014. It provides durable construction and the components needed for a proper rebuild.

This Wiseco Forged Series piston set is engineered for versatility across small-displacement 4-stroke ATVs and offers improved strength over cast pistons for long-term reliability under typical riding stresses. The kit includes the piston, wrist pin, rings, and circlips for straightforward installation, and the 47.50 mm bore with a 10.5:1 compression ratio matches the specified fitment for these Polaris models. Ideal for enthusiasts who are restoring, refreshing, or mildly modifying their machine, the forged material optimizes service life while maintaining OEM-style fit and function.

Features

• Forged piston construction for improved durability
• Complete kit: piston, wrist pin, rings, and circlips included
• 47.50 mm bore sized for Polaris Outlaw/Sportsman 90 (2007–2014)
• 10.5:1 compression ratio matched to the listed models
• Suitable for ATVs, dirt bikes and other 4-stroke small-displacement applications

If you have questions about fitment or installation, call us directly — we’re happy to help. We offer installation and customization services at our two locations in Austin, Texas and the Los Angeles, California area. Call 512-982-9393 (TX) or 562-981-6800 (CA) to discuss this piston set, book shop time, or confirm compatibility. If you’re thinking about purchasing multiple items, contact us for shipping discounts. We install on premises at both locations.

CA Residents: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov