Kawasaki EX250 Ninja Piston Kit - Wiseco - 12.5:1 CR, 62.00 mm Bore - `08-`12. This Wiseco Forged Series piston kit is built for riders and tuners who need a robust, OEM-fit replacement or a reliable component for mild performance builds on 2008–2012 EX250 Ninja engines.

These forged 4-stroke pistons are supplied as a complete package — each kit includes the piston, wrist pin, rings, and circlips — so you have what’s required for installation. Forged construction increases resistance to fatigue and heat compared with cast pistons, helping maintain piston integrity under higher stress and extended use. Sized to a 62.00 mm bore with a 12.5:1 compression ratio, this kit matches Wiseco’s specifications for the listed Ninja model years and is intended for enthusiasts who demand durable, serviceable components when performing rebuilds or modest engine upgrades.

Features

• Forged piston construction for enhanced strength and longevity
• Complete kit: piston, wrist pin, rings, and circlips included
• 62.00 mm bore fitment; 12.5:1 compression ratio
• Designed for 2008–2012 Kawasaki EX250 Ninja 4-stroke engines
• Manufactured by Wiseco to match common OE dimensions and tolerances

This piston kit is ideal for someone rebuilding an EX250 motor or preparing a bike for higher-rev operation where component durability matters. It is not a plug-and-play power increase on its own, but it provides the durable foundation many builders prefer when assembling revised combustion components or performing head and fueling work.

If you have questions or need help selecting the right parts, call us directly — 512-982-9393 (TX) or 562-981-6800 (CA). We have two locations in Austin, Texas and Los Angeles, California area at which we offer installation and customization services. If you’re considering multiple items, contact us for shipping discounts. We install on premises at both locations.

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