Kawasaki KFX400 Piston Kit - Wiseco - Forged Series, 94.50 mm Bore, 13.5:1 CR - `03-`06. This Wiseco Forged Series piston kit is built for riders who need a reliable, serviceable replacement or upgrade for 2003–2006 KFX400 engines. It matches the specified bore and compression ratio for a direct-fit installation when machining and clearances are correct.

Designed for 4-stroke applications, the Forged Series pistons use a forged alloy construction that improves strength and wear resistance compared with standard cast pistons. The kit ships complete with piston, wrist pin, rings, and circlips so you have the core hardware needed for assembly. The 94.50 mm bore and 13.5:1 compression ratio are listed for KFX400 2003–2006 applications; the piston’s precision machining helps maintain consistent clearances and durability under typical ATV and UTV operating conditions.

Features

• Forged aluminum piston for improved strength and longevity
• Complete kit: piston, wrist pin, rings, and circlips included
• 94.50 mm bore with 13.5:1 compression ratio — specified for KFX400 (`03–`06)
• Precision-machined for consistent fit and serviceability
• Suitable for a range of 4-stroke applications (ATVs, UTVs, dirt bikes) when matched to engine specs

If you have questions about fitment, clearances, or compatibility with your build, call us directly — we’re happy to help: 512-982-9393 (TX) or 562-981-6800 (CA). We have two locations offering installation and customization services: Austin, Texas and the Los Angeles, California area. If you’re considering multiple items, contact us for possible shipping discounts. We install on premises at both locations and can advise on proper installation procedures for best results.

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