PROX - 01.2427.A - Piston Kit - 94.95 mm - Yamaha WR426F/YZ426F
When it is time for a top-end rebuild, the piston you choose sets the ceiling on everything that comes after, and the PROX 01.2427.A at 94.95 mm delivers the precision and material quality that serious riders and race mechanics expect. Kit includes piston, rings, wrist pin and circlips, ensuring dimensional accuracy from the first start-up. Precision machined on state of the art CNC equipment, which means it holds tight tolerances longer and runs cooler than standard alloy alternatives. Made with low expansion, low friction alloy, and piston Size: 94.95 mm helps the new piston seat properly during break-in. Bore - Oversize: Standard, rounding out a component built for reliability from the very first fire-up through thousands of miles. Whether you are refreshing a worn top-end or building a motor from scratch, the 01.2427.A gives you a solid foundation for a long-lasting engine. Sold as a complete kit.
Features
- Kit includes piston, rings, wrist pin and circlips
- Precision machined on state of the art CNC equipment
- Made with low expansion, low friction alloy
OEM Part Numbers: 5JG-11631-00
Specs
- Piston Size: 94.95 mm
- Bore - Oversize: Standard
- Riding Style: Adventure Touring / Dual-Sport
- Riding Style: Street
- Displacement: 426 cc
- Engine Type: 4-Stroke
- Bore Size: 95.00 mm
- Riding Style: Off-Road
- Type: Standard Size A
- Units: Kit
- Compression Ratio: 12.5:1
- Piston Material: Aluminum Alloy
- Product Name: Piston Kit
- Skirt Coating: Non-Coated
OEM Part Numbers
- 5JG-11631-00
Frequently Asked Questions - PROX - 01.2427.A - Piston Kit - 94.95 mm - Yamaha WR426F/YZ426F
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.
