Yamaha YZ250F Piston Set - Wiseco 7700YC 13.5:1 CR (’14–’15). A direct-fit forged piston kit designed for Yamaha YZ250F 2014–2015 models, supplied with rings, wrist pin, and circlips for a complete top-end refresh.

This Wiseco piston kit is engineered for 4-stroke powersports use and manufactured to tight tolerances to match the YZ250F’s requirements. The forged construction increases tensile strength and durability compared with many cast alternatives, while the dedicated forging and machining process helps maintain an optimized strength-to-weight ratio. The kit covers a 77.00 mm bore and a 13.5:1 compression ratio and is produced in Mentor, Ohio, USA.

Features

• Wiseco forged piston, model 7700YC — 77.00 mm bore
• 13.5:1 compression ratio (designed for YZ250F ’14–’15)
• Includes piston rings, wrist pin(s), and circlips
• Engineered and machined in the USA (Mentor, OH)
• Designed for specific 4-stroke powersports engine application

If you have questions or want help confirming fitment, call us directly — we’re happy to help. We have two locations where we offer installation and customization services: Austin, Texas and the Los Angeles, California area. Call: 512-982-9393 (TX) or 562-981-6800 (CA). If you’re considering multiple items, contact us for possible shipping discounts. We install on premises at both locations.

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