Yamaha WR 125 [VERTEX] – piston set cast big bore for 2-stroke

VERTEX piston set cast big bore for Yamaha WR 125 (2-stroke)

The cast big bore piston set from VERTEX has been specially developed for the 2-stroke engine of the Yamaha WR 125. This set enables a displacement expansion to 144 cm³ thanks to a bore oversize of +4.00 mm. The pistons are made of a high-quality aluminum alloy and have a cast design, which ensures reliable and long-lasting function.

Technical characteristics

• Brand: VERTEX
• Product name: Piston set cast big bore
• Engine type: 2-stroke
• Displacement: 144 cm³
• Bore - Oversize: +4.00mm
• Piston diameter: 57.96mm
• Cylinder diameter: 58.00mm
• Piston material: Aluminum alloy, cast
• Coating of piston skirt: Molybdenum disulfide
• Compression ratio: Default
• Number of pieces: Kit (piston and rings)

Product description

The piston set consists of a cast piston with a special molybdenum disulfide coating on the piston skirt. This coating reduces the friction between the piston and the cylinder bore, thereby contributing to better heat dissipation and a longer service life. Due to the oversized bore, the engine displacement is increased to 144 cm³, which allows the engine characteristics to be changed.

The compression ratio remains in the standard range, thereby maintaining compatibility with the existing cylinder and engine mechanics. The piston set is delivered as a complete kit, which includes the piston as well as the matching piston rings. This makes installation easier and ensures that the components are optimally coordinated with each other.

The use of cast aluminum alloy ensures high strength and low weight. This is particularly important for the dynamic requirements in the 2-stroke engine of the Yamaha WR 125. The precise dimensions and careful workmanship support reliable function and a long service life of the engine.