Yamaha Genuine YZ400F / WR400F Standard Piston 5GR-11631-00-00
Yamaha Genuine YZ400F / WR400F Standard Piston 5GR-11631-00-00
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Product Description
Brand new official Yamaha factory standard-size piston designed for pioneering four-stroke high-performance enduro and motocross engine overhauls. Precision-forged or cast from advanced high-temperature aluminum alloy to exact factory specifications, engineered to deliver precise piston-to-wall clearance, maximum compression retention, and superior thermal durability under demanding racing conditions.
Vehicle Compatibility
Engineered explicitly for Yamaha classic high-performance four-stroke off-road platforms.
Verified catalog fitment layout:
| Make | Model Family | Engine Type / Displacement | Model Years |
| Yamaha | YZ400F / YZ400 | 400cc (Liquid-Cooled 4-Stroke DOHC Single) | 1998–1999 |
| Yamaha | WR400F / WR400 | 400cc (Liquid-Cooled 4-Stroke DOHC Single) | 1998–2000 |
Fitment & Technical Details
Verify cylinder bore measurement and cross-hatch condition to match standard factory sizing tolerances. Check ring end gaps, piston pin clearance, and piston-to-cylinder wall clearance strictly to factory service manual specifications prior to assembly. Liberally lubricate the wrist pin, small/big-end components, and cylinder walls with clean engine oil before final installation.Verification: Piston glides smoothly through the plated cylinder bore with exact factory-specified clearance, ensuring optimal ring sealing, reduced mechanical friction, and maximum combustion efficiency.
Important: Please ensure the part number matches your motorbike before purchasing. If you have any questions about the part or its compatibility, feel free to contact us. We’re here to help!
At Dmmotorcycles, we’ve specialized in vintage and vintage sports motorcycles and parts directly from Japan since 1998. We stock a wide selection of rare genuine and high-quality aftermarket parts and continually update our inventory to meet growing demand.
Looking for a specific part? Don’t hesitate to ask! We may have it in stock even if it’s not listed online. If not, we’ll do our best to source it for you.
We’re also happy to provide guidance on installation and offer excellent after-sales support to ensure your satisfaction.
Shipping Information
We ship worldwide, carefully inspecting and securely packing all parts to ensure safe delivery. Your order will be insured and shipped quickly, with the best available shipping option chosen for speed and reliability.
Please note:
- All parts are shipped from Cyprus (Europe).
- Customers outside the EU may incur additional import taxes based on the value of the item.
How we handle your order in 4 steps
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1. Order Verification
We confirm the order and make sure the correct part number, quantity, and any special requests match what’s on the sales confirmation
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2. Quality Check
Since our parts are new old stock we Inspect the parts for any defects, scratches, or missing components to ensure it meets quality standards. otherwise will notify you before proceeding with the order.
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3. Safe and Secure packaging
- Protective Wrapping: We use bubble wrap or foam padding to wrap the part, focusing on sharp edges or delicate components.
- Boxing: We place the wrapped part inside a sturdy box, filling gaps with packing materials to prevent movement.
- Sealing and Labeling: Securely tape the box and attach the shipping label, including orientation-specific markers like "Fragile."
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4. Finalizing of Shipment
We confirm the shipping address and contact details, give the package to the Post, keep the tracking number, and then send it to the customer along with the shipment notification.
