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Cylinders & Barrels

SHOP PISTONS, RINGS & CYLINDER PARTS

Rebuilding a top end? We stock a range of genuine OEM pistons and piston ring sets, mostly for Kawasaki motorcycles, including two-stroke motocross and enduro bikes like the KX60, KX80, KX125, KX250, KDX175, KDX200 and KDX250, and four-strokes such as the GPZ900R, GPX750R, ZXR750, ZX-10, KLR250, KLR650, GPX250R and Z1 900.

Many of these are new old stock genuine parts that are no longer easy to find, in standard size and selected oversizes (+0.50 mm).

Using a genuine piston and the correct ring set is the best way to get the right fit, compression and reliability from a rebuild. Each listing shows the OEM part number, size and the exact models and years it suits.

While the barrel is off, always fit a new base gasket and fresh O-rings from our gaskets & seals range. Not sure whether your engine needs a quick top-end freshen-up or a full rebuild? Our guide to top-end vs bottom-end engine rebuilds explains the difference. If you're chasing a top-end rattle at the same time, our camshafts & cam chain parts are in the same engine & engine parts section.

Chasing a particular part for your bike?
Tell us what you're looking for and our Motorcycles Plus team will help you track down the right part.

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FAQ – Pistons, Rings & Cylinder Parts

How do I know which piston size I need?

Measure your cylinder bore, or have it measured by a machinist. If the bore is within the service limit, a standard size piston is usually fine. If it has been bored out, you'll need the matching oversize, such as +0.50 mm. The size is shown in each listing.

Should I replace the piston rings when I fit a new piston?

Yes. Always fit new rings with a new piston, and check the ring end gap in the bore before fitting. Old rings won't seal properly against a new piston and can cost you compression.

Do your pistons come with rings, pin and clips?

It depends on the part number. Some genuine pistons are supplied as a piston only, while others include the gudgeon pin and circlips. Ring sets are sold separately. Check the listing and photos to see exactly what's included.

Can I fit a piston from a different year of the same model?

Not always. Kawasaki often changed pistons between years and markets, even on the same model (for example the KX80 and KX125). Always match the OEM part number and model code rather than relying on the year alone.

Do I need to hone or bore my cylinder before fitting a new piston?

At minimum, the bore should be checked for wear, taper and scoring, and lightly honed so new rings can bed in. If it's beyond the service limit, it will need boring to the next oversize. A good engine shop can measure and prep it for you.

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