Description
The ProX Piston Kit for Kawasaki Ultra 300 X LX 2011 2013 A size is engineered for the high output supercharged four stroke platform that powers these Jet Ski models. As an A size piston, it is intended for cylinders on the smaller end of the factory bore tolerance range, helping ensure tight, controlled clearances that support efficiency and durability. Riders who push their Ultra 300 hard can rely on this kit as part of a professional level rebuild.
- A size piston kit matched to specific Kawasaki Ultra 300 X LX model years and cylinder size classifications.
- Includes piston, ring kit, wrist pin, and circlips, offering a complete piston group for one cylinder.
- Built from a strong low expansion, low friction alloy and precision CNC machined for consistent quality.
- Designed to operate at OEM style clearance levels when paired with correctly measured A size bores.
- Suitable for demanding supercharged use, from aggressive lake riding to offshore conditions.
High boost, high rpm engines depend heavily on piston integrity and ring sealing, making material and machining quality critical. ProX focuses on these aspects to deliver parts that can cope with the thermal and mechanical stresses of the Ultra 300 platform. When installed correctly, this kit can help restore strong compression, smooth running, and confident acceleration.
Engine builders should carefully gauge the bores, verify the correct size group, and inspect all rotating and valvetrain components. Follow manufacturer recommendations for torque, lubrication, and gasket replacement, and confirm that the cooling and supercharger systems are in top condition. With meticulous preparation, the ProX A size piston kit can contribute to an Ultra 300 engine that feels tight, responsive, and ready for serious use.
