Kawasaki EX250 Ninja Piston Set - Wiseco - 12.5:1 CR - `08-`12. This Wiseco forged piston kit is made for the 2008–2012 EX250 Ninja, offering a 66.00 mm bore piston with a 12.5:1 compression ratio as a durable, direct-replacement option for engine rebuilds and mild performance upgrades.

The Forged Series 4-stroke piston is engineered for broad use across street and track applications. Forged construction optimizes strength and service life under higher thermal and mechanical stress. This kit arrives complete with piston, wrist pin, piston rings and circlips to simplify installation. The design retains compression and resists wear for consistent operation; it is suitable for stock rebuilds and builds with modest modifications when installed following factory procedures and specifications.

Features

• Wiseco forged piston for improved durability compared to cast alternatives
• Complete kit: piston, wrist pin, rings and circlips included
• 66.00 mm bore; 12.5:1 compression ratio specific to EX250 `08–`12
• Direct fit for 2008–2012 Kawasaki EX250 Ninja
• Designed for street and light track use, suitable for engine rebuilds and mild performance applications

If you have questions or need fitment advice, 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. 512-982-9393 (TX) | 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