High-performance gravity-cast replacement piston kit engineered to restore top-end compression and crisp throttle response, matched to a Size B cylinder bore tolerance. Manufactured from a high-silicone aluminum alloy with a friction-reducing Molybdenum Disulphide skirt coating for a faster break-in and extended component life.
Specs & Details
- Manufacturer Part Number: 175-23119B
- Brand Number: 23119B
- Component Type: Cast Replica Piston Kit (Includes piston, rings, wrist pin, and circlips)
- Size / Bore: Size B (53.94 mm)
- Material & Construction: Gravity-cast high-silicone aluminum alloy with T-5 heat treatment and MoS2 skirt coating
Two-Stroke Vehicle Fitment
| Make | Model | Engine Type | Year Range |
| Yamaha | YZ125 | Two-Stroke Motocross | 2005–2021 |
| Yamaha | YZ125X | Two-Stroke Off-Road / Enduro | 2020–2022 |
TSO Garage Note
An ideal top-end refresh component for keeping your late-model Yamaha YZ125 or YZ125X hitting the powerband cleanly, specifically matched to factory Size B cylinder tolerances. The precision-cast profile and coated skirt minimize friction and wear against the bore, making routine rebuilds straightforward and reliable.
