This is a genuine Yamaha OEM 123cc liquid-cooled 2-stroke cylinder block featuring a cast iron sleeve pressed into a lightweight aluminum housing. The factory 10W00 casting includes the original reed-valve induction layout and liquid-cooling jacket design used on early Yamaha 125cc models. Technical Specifications * Manufacturer: Yamaha OEM * Part Number: 10W-11311-00-00 * Casting ID: 10W00 * Engine Type: 2-Stroke, Single Cylinder * Cooling: Liquid-Cooled * Displacement: 123cc * Bore x Stroke: 56.0 mm x 50.0 mm * Material: Aluminum housing with cast iron sleeve Vehicle Compatibility * Yamaha RD125LC Mk1 / Early Models: 1982-1984 * Yamaha DT125LC Early Liquid-Cooled Models: 1982-1983 Fitment Note Later 125cc Yamaha models may use different YPVS or cylinder layouts. Verify the 10W casting pattern, mounting points, and bore requirements before purchase.
Please verify compatibility with your specific motorcycle model before purchasing.
Cleaning Status
partially_cleaned
Cleaning Notes
Used anti rust
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Yes, all parts with OEM numbers are genuine manufacturer parts. Check the specifications tab for the OEM number.
We offer a 30-day return policy. Items must be in original condition. See the Shipping tab for complete details.
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Parts are sold separately. We recommend professional installation for safety and warranty purposes.
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