ATHENA - S4F05400011A - Piston Kit - 53.94 mm - Yamaha YZ125
The ATHENA S4F05400011A Piston Kit is a forged race-grade, 4032 aluminum alloy piston sized for the 53.94 mm (124 cc) bore on 1997-2004 Yamaha YZ125 2-stroke models, equipped with low-friction piston rings designed for OEM cylinders and tested on dynamometer benches and track to validate performance under extreme conditions.
Features
- High resistance to mechanical and thermal stresses
- Has been tested on engine dynamometer benches under progressive stress load, and thereafter on track to validate it performance even in the most extreme conditions
- Equipped with piston rings that guarantee less friction with the OE cylinder producing a higher performance
- Made by reverse extrusion
- For OE cylinder.
Specs
- Type: A
- Riding Style: Off-Road
- Compression Ratio: Stock
- Piston Head Shape: Domed
- Style: Forged Race
- Units: Kit
- Engine Type: 2-Stroke
- Product Name: Piston Kit
- Bore Size: 53.94 mm
- Displacement: 124 cc
- Piston Material: 4032 Aluminum Alloy
Frequently Asked Questions - ATHENA - S4F05400011A - Piston Kit - 53.94 mm - Yamaha YZ125
How do I know if this part fits my vehicle?
Check the fitment information listed on this page against your exact year, make, model, and (where applicable) trim, engine size, or configuration. If your exact vehicle isn't listed, or you're not sure, use the product chat on this page or contact our support team before ordering - we're glad to help confirm fitment.
What does it mean if a product is listed as universal fit?
Universal fit means the product is designed to work across a range of vehicles, not that it's guaranteed to fit every one. Compare the listed measurements, mounting requirements, and connector or hardware specs against your specific vehicle before ordering, since some installations may need additional hardware or minor fabrication.
Where can I find installation instructions for this product?
General installation notes are provided above where available. For detailed step-by-step instructions, refer to the manufacturer's documentation included with the product, or use the product chat on this page for questions about difficulty, required tools, or whether professional installation is recommended.
What if I have more questions about this product?
Use the product chat on this page for fitment, specs, installation, and compatibility questions, or contact our support team directly for help before you order.
