Yamaha Genuine TW125 / SR125 1.00mm Oversize Piston 25A-11638-00
Yamaha Genuine TW125 / SR125 1.00mm Oversize Piston 25A-11638-00
Low stock: 3 left
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Product Description
Brand new official Yamaha factory fourth oversize piston designed for classic single-cylinder four-stroke engine overhauls. Precision-cast from high-grade aluminum alloy to exact factory 1.00mm oversize specifications, engineered to restore proper cylinder wall clearance, compression, and thermal stability during top-end maintenance.
Vehicle Compatibility
Engineered explicitly for Yamaha classic lightweight four-stroke commuter and trail platforms.
Verified catalog fitment layout:
| Make | Model Family | Engine Type / Displacement | Model Years |
| Yamaha | TW125 Trailway |
125cc (Air-Cooled 4-Stroke Single) |
1999–2004 |
| Yamaha | SR125 |
125cc (Air-Cooled 4-Stroke Single) |
1982–2002 |
| Yamaha | XT125 |
125cc (Air-Cooled 4-Stroke Single) |
1982–1983 |
Fitment & Technical Details
Verify cylinder bore measurement matches the 1.00mm fourth oversize specification (paired with corresponding 1.00mm piston rings). Check ring end gaps and piston-to-cylinder wall clearance within factory service manual tolerances prior to assembly. Lubricate the wrist pin, bearing, and cylinder wall with fresh engine oil before installation. Verification: Piston slides smoothly through the bored cylinder sleeve with correct clearance, ensuring optimal sealing and minimal friction under operating temperatures.
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.
