ATHENA - S4F08100005B - Piston Kit - 80.96 mm - Yamaha WR250F/YZ250F
The ATHENA S4F08100005B is a forged 2618 aluminum big-bore piston kit for 2014-2018 Yamaha YZ250F and WR250F models, sized at 80.96 mm bore with a 13.2:1 compression ratio, engineered to resist mechanical and thermal stresses with validation through dynamometer bench testing and extreme track 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
Specs
- Displacement: 250 cc
- Type: B
- Engine Type: 4-Stroke
- Style: Forged Big Bore
- Model: Racing
- Piston Material: Forged 2618 Aluminum
- Product Name: Piston Kit
- Riding Style: Off-Road
- Bore Size: 80.96 mm
- Units: Kit
- Compression Ratio: 13.2:1
Frequently Asked Questions - ATHENA - S4F08100005B - Piston Kit - 80.96 mm - Yamaha WR250F/YZ250F
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.
