Name: Piston Kit Yam XS650 76.50, Wossner K8818D150-2 680cc
Brand: Wossner
SKU: 56-W9899.150.WO

Piston Kit Yam XS650 76.50, Wossner K8818D150-2 680cc

Wossner
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Description

This piston kit is designed for Yamaha XS650 motorcycles manufactured between 1974 and 1981. It includes a set of four forged Wossner pistons with a +1.50mm oversize (76.50mm bore), engineered for enhanced durability and performance. The elliptical piston design ensures even distribution of thrust loads under heat expansion, helping to prevent localised stress and piston collapse. Manufactured in Germany, this kit supports both standard and slightly increased engine displacements.

Features

Set of 4 forged Wossner pistons
+1.50mm oversized bore (76.50mm, actual piston diameter 76.44mm)
Elliptical design for balanced heat expansion and load distribution
Designed for optimal heat transfer to cylinder walls
Made in Germany

Specifications

Part Number: K8818D150-2
Bore Size: 76.50mm (actual piston size 76.44mm)
Oversize: +1.50mm
Displacement: 679 / 688cm³
Stroke: 74.00mm
Clearance: 0.06mm
Wossner Compression Ratio: OEM
OEM Compression Ratio: 8.40:1
Dome Volume: +23.40cm³
Compression Height: 29.00mm

Cross-Reference OEM Part Numbers

Clips: CW20
Piston Pin: WP068
Rings: 765XDS

Vehicle Fitments

Yamaha XS650 1974–1981

Vehicle Compatibility

Please check the exact model and year before ordering.

Manufacturer	Model	Years
YAMAHA	XS 650	1974-1981

Piston Kit Yam XS650 76.50, Wossner K8818D150-2 680cc

Wossner
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This piston kit is designed for Yamaha XS650 motorcycles manufactured between 1974 and 1981. It includes a set of four... Read more

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SKU: 56-W9899.150.WO

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Description

This piston kit is designed for Yamaha XS650 motorcycles manufactured between 1974 and 1981. It includes a set of four forged Wossner pistons with a +1.50mm oversize (76.50mm bore), engineered for enhanced durability and performance. The elliptical piston design ensures even distribution of thrust loads under heat expansion, helping to prevent localised stress and piston collapse. Manufactured in Germany, this kit supports both standard and slightly increased engine displacements.

Features

Set of 4 forged Wossner pistons
+1.50mm oversized bore (76.50mm, actual piston diameter 76.44mm)
Elliptical design for balanced heat expansion and load distribution
Designed for optimal heat transfer to cylinder walls
Made in Germany

Specifications

Part Number: K8818D150-2
Bore Size: 76.50mm (actual piston size 76.44mm)
Oversize: +1.50mm
Displacement: 679 / 688cm³
Stroke: 74.00mm
Clearance: 0.06mm
Wossner Compression Ratio: OEM
OEM Compression Ratio: 8.40:1
Dome Volume: +23.40cm³
Compression Height: 29.00mm

Cross-Reference OEM Part Numbers

Clips: CW20
Piston Pin: WP068
Rings: 765XDS

Vehicle Fitments

Yamaha XS650 1974–1981

Vehicle Compatibility

Please check the exact model and year before ordering.

Manufacturer	Model	Years
YAMAHA	XS 650	1974-1981

Shipping & Delivery

How long will my item take to arrive?

Orders are typically dispatched within 1 working day and are shipped on a 24hour (non-guaranteed) service.

Where do you ship to?

We currently only ship orders within the UK.

How can I track my order?

Once your order has been dispatched, you will receive a tracking code. Tracking information is emailed to the email address that was provided when placing the order.

Can I collect my order?

Unfortunately we do not offer order collections from our fulfilment centre.