Kawasaki KX250F Piston Kit - Wiseco - 7700YC - `07-`09. A precision-forged replacement piston kit for 2007–2009 KX250F models, engineered for 4-stroke powersports engines and built to tight manufacturing tolerances.

Wiseco designs dedicated forgings for specific engines, and this kit is machined in Mentor, OH to match the KX250F 77.00 mm standard bore and the listed 13.51 (commonly referenced as 13.5:1) compression ratio. The forged material offers improved tensile strength over cast alternatives, helping the piston withstand track and trail conditions while retaining an optimized strength-to-weight balance. The kit arrives with high-quality piston rings, wrist pin(s), and circlips so it’s suitable for rebuilds, maintenance, or performance-oriented engine work without requiring extra basic hardware.

Features

• Forged 4-stroke piston specifically for Kawasaki KX250F `07–`09
• 77.00 mm bore, 13.5:1 compression ratio (13.51 CR specified)
• Includes piston rings, wrist pin(s), and circlips
• Dedicated forging for optimized strength-to-weight
• Engineered, forged, and machined in the USA (Mentor, OH)

If you have any questions about fitment, compatibility, or installation, call us directly — we’ll help confirm this kit is right for your build. We offer installation and customization services at our two locations in Austin, Texas and the Los Angeles, California area. Call us: 512-982-9393 (TX) or 562-981-6800 (CA).

If you are 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