Description
The ProX Piston Kit for Kawasaki STX 15F 2004 2014 and Ultra LX 2007 2014 in C size is intended for cylinders that measure at the larger end of the original bore tolerance range. Manufacturers often grade pistons so that final clearances can be tuned more precisely, and this C version follows that strategy while maintaining ProX’s reputation for high quality materials and machining. It is well suited to rebuilds where accurate measurement indicates that a C size piston is the correct match.
- C size piston kit for Kawasaki STX 15F and Ultra LX engines with cylinders requiring the largest of the A B C size groups.
- Supplied with piston, rings, wrist pin, and circlips to form a complete cylinder specific piston assembly.
- Constructed from a low friction, low expansion alloy and finished with high precision CNC machining for consistency.
- Supports factory style clearances when the cylinder has been measured correctly and falls into the C classification.
- Part of the broader ProX four stroke Jet Ski piston program designed for OEM style reliability and performance.
Using properly graded pistons helps manage cold start noise, oil control, and long term wear characteristics in modern four stroke engines. This ProX C size kit, when paired with correctly gauged cylinders, can contribute to a quiet, smooth running STX 15F or Ultra LX that feels very close to new. It is particularly valuable for owners and shops committed to precise, professional level rebuilds.
Before ordering or installing, confirm bore measurements with quality tools and determine the correct size group. Follow recommended assembly and torque procedures, and address other common wear items such as valve stem seals and timing components. When the entire top end is serviced to this standard, the ProX C size piston kit becomes a reliable core component in a long lasting four stroke Jet Ski rebuild.
