






ATHENA
TOP END PISTON KIT; YAMAHA 125 YZ 05-21
Out of stock · stock as of Sep 3, 2026
Shipping calculated at checkout
30-day returns on unused parts
Details
Breathe new life into your 125cc 2-stroke engine with this ultimate, all-in-one top-end rebuild kit. Athena has perfectly paired a premium, gravity-cast high-silicon aluminum piston with their industry-leading top-end gaskets for a seamless and highly reliable rebuild. The precision CNC-machined piston ensures flawless fuel flow and optimal flame propagation, while a perfectly smooth profile and specialized molybdenum disulfide skirt coating greatly reduce internal friction for enhanced power and longevity. Accompanied by gaskets that have undergone advanced stress-relieving processes and proprietary surface treatments, this kit guarantees an unbeatable seal under extreme cylinder pressures. Reclaim your factory compression and hit the track with maximum performance! Complete top-end solution perfectly pairing a cast 2-stroke piston and comprehensive gasket kit Gravity-cast from a specialized high-silicon aluminum alloy for exceptional strength and heat resistance Molybdenum disulfide skirt coating drastically reduces friction and internal engine wear Precision CNC-machined profile ensures optimal fuel flow and perfect flame propagation Advanced gaskets feature proprietary surface treatments and stress-relieving processes for maximum sealing reliability Includes: Cast 2-Stroke Piston (Flat Head) Piston Ring (1) Standard Piston Pin / Wrist Pin Complete Top End Gasket Kit Displacement: 125cc Piston Size: 53.95mm Pin Dimensions: 15 x 10 x 45mm Compression: Standard
Specs
- Vehicle
- Offroad
- Weight Lb
- 0.0
- Shipping Class
- standard


