Piston kits

Piston kits contain all the components needed to fully replace your motorcycle's pistons, which are the reciprocating engine parts responsible for compressing the fuel-air mixture, transferring combustion force to the crankshaft, and sealing the cylinder bore. At Xpert Shop, our piston kits include the piston, piston rings, wrist pin, wrist pin circlips, and associated hardware for a complete and reliable engine rebuild. Riders trust Xpert Moto Gear piston kits to restore full compression, eliminate oil consumption, and return the engine to factory power output and efficiency.

Xpert Moto Gear piston kits are supplied as complete sets including the forged or cast piston in the correct bore size, a full set of piston rings, the wrist pin, and retaining circlips. Performance kits may also include a high-compression piston dome, coated skirts for reduced friction, and gas-ported rings for improved sealing under high cylinder pressures. By bundling all replacement components together, Xpert Shop ensures riders have everything required for a thorough engine rebuild without sourcing individual parts from multiple suppliers.

Common symptoms of worn pistons include loss of compression, excessive oil consumption, blue or white exhaust smoke, rattling or slapping noises from the engine, reduced power and poor throttle response, and fouled spark plugs from oil entering the combustion chamber. A bore measurement revealing wear beyond the manufacturer's service limit, or visible scoring, scuffing, or ring groove wear discovered during engine inspection, confirms piston replacement is required. Xpert Moto Gear recommends replacing pistons as part of any top-end rebuild to restore full cylinder sealing and prevent accelerated bore wear.

Yes. Xpert Moto Gear stocks piston kits in standard bore sizes as well as oversize options including 0.25 mm, 0.50 mm, and 1.00 mm overbore dimensions to accommodate cylinders that have been bored or honed to correct wear and restore a true circular bore. Each oversize kit is manufactured to the corresponding dimensional specification, ensuring correct piston-to-wall clearance and ring end gap for reliable sealing and long service life. Xpert Shop's fitment data clearly identifies available sizes for each application, making it straightforward to select the correct kit for your engine's current bore condition.

Yes. Xpert Moto Gear strongly recommends replacing the cylinder bore gasket set, cylinder head gasket, small end bearing, and camchain or timing components whenever pistons are replaced, as these parts are exposed during the rebuild and wear in relation to the piston. If the cylinder bore shows wear beyond standard limits, professional boring and honing to the next oversize is required before fitting an oversize piston kit. Xpert Shop stocks all associated top-end components to support a complete and reliable piston replacement, ensuring the rebuilt engine delivers full performance and long-term durability.

Xpert Moto Gear piston kits are precision-manufactured to exact bore dimensions, ring groove tolerances, and wrist pin specifications, ensuring correct fitment, reliable compression sealing, and long engine life from the first start. Whether restoring a worn engine to factory specification or building for increased performance, Xpert Shop offers the right piston kit for your application backed by comprehensive fitment data, expert technical support, and fast shipping. Riders choose Xpert Moto Gear because our engine components are built to perform under demanding conditions and engineered to keep their motorcycle running strong for thousands of kilometres to come.