ATHENA - S4F102000040 - Piston Kit - 101.96 mm - Yamaha YZ450F/YZ450FX
The ATHENA S4F102000040 is a forged big-bore piston kit for 2010-2022 Yamaha YZ450F and YZ450FX models, engineered with a 101.96 mm bore size, 12.2:1 compression ratio, and 2618 forged aluminum construction to resist mechanical and thermal stresses — validated through engine dynamometer testing and competitive track performance.
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: 450 cc
- Style: Forged Big Bore
- Riding Style: Off-Road
- Type: Standard
- Product Name: Piston Kit
- Units: Kit
- Model: Racing
- Compression Ratio: 12.2:1
- Piston Material: Forged 2618 Aluminum
- Bore Size: 101.96 mm
- Engine Type: 4-Stroke
Frequently Asked Questions - ATHENA - S4F102000040 - Piston Kit - 101.96 mm - Yamaha YZ450F/YZ450FX
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.
