ProX Piston Kit for Kawasaki KX85 (01.4121.A)

The PROX 01.4121.A Piston Kit is an OEM replacement solution designed for Kawasaki KX85 applications. Manufactured in Japan, this piston kit is built to deliver dependable fitment, consistent performance, and long-lasting durability for powersports engine rebuilds and maintenance. PROX uses a high-silicon-content aluminum alloy that meets or exceeds OEM specifications, helping provide the strength and thermal stability required for demanding two-stroke engine operation.
The piston is CNC-machined to extremely close tolerances for accurate fitment and reliable operation. Precision manufacturing supports consistent piston movement, proper ring seating, and dependable engine performance when replacing worn or damaged components. This kit is designed for riders, technicians, and rebuilders seeking quality replacement parts from a trusted powersports brand.
The PROX 01.4121.A kit includes the essential components needed for installation: a piston, ring kit, wrist pin, and circlips. Verify application compatibility with your Kawasaki KX85 before installation and follow the manufacturer’s service procedures for inspection, assembly, and break-in. With its OEM replacement design and complete component package, this PROX piston kit provides a practical choice for restoring engine performance and supporting a professional rebuild.

Features:

• Manufactured in Japan for reliable quality and consistent production standards

• Designed as an OEM replacement for Kawasaki KX85 applications

• Cast from high-silicon-content aluminum alloy to meet or exceed OEM specifications

• CNC-machined to extremely close tolerances for accurate fitment

• Complete kit includes piston, ring kit, wrist pin, and circlips

• Brand: PROX

• Part Number: 01.4121.A

Ships from Parts Unlimited.