Name: Piston Kit 77-78 YZ400 86.00, Wossner 8264D100 Yamaha MX, 77-78 IT400
Brand: Wossner
SKU: 56-W550_1.00.WO

Piston Kit 77-78 YZ400 86.00, Wossner 8264D100 Yamaha MX, 77-78 IT400

Wossner
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Description

This Wossner piston kit features an 86mm bore size (85.92mm actual) and is designed for Yamaha YZ400 and IT425 models from 1977 to 1978. Forged in Germany, the piston is engineered for optimal strength and heat management. Its elliptical profile distributes thrust loads uniformly during thermal expansion, reducing localised pressure and minimising the risk of piston collapse.

Features

Forged construction for enhanced structural integrity
Elliptical design ensures uniform load distribution under heat expansion
Promotes efficient heat transfer from combustion chamber to cylinder walls
Manufactured in Germany

Specifications

Bore Size: 86mm (85.92mm)
Display: 398 cm³
Stroke: 70.00 mm
Clearance: 0.08 mm
Compression Height: 35.00 mm
Compression Ratio: 2-stroke (Wossner and OEM)

Cross-Reference OEM Part Numbers

Piston Kit: 8264D100
Lock: CW18
Pin: WP042
Ring Set: RSC8600 x2
Part No.: 56-W550_1.00.WO

Vehicle Fitments

Yamaha YZ400 1977
Yamaha YZ400 1978
Yamaha IT425 1977
Yamaha IT425 1978

Vehicle Compatibility

Please check the exact model and year before ordering.

Manufacturer	Model	Years
YAMAHA	YZ 400	1977-1978
YAMAHA	IT 425	1977-1978

Piston Kit 77-78 YZ400 86.00, Wossner 8264D100 Yamaha MX, 77-78 IT400

Wossner
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This Wossner piston kit features an 86mm bore size (85.92mm actual) and is designed for Yamaha YZ400 and IT425 models... Read more

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SKU: 56-W550_1.00.WO

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Description

This Wossner piston kit features an 86mm bore size (85.92mm actual) and is designed for Yamaha YZ400 and IT425 models from 1977 to 1978. Forged in Germany, the piston is engineered for optimal strength and heat management. Its elliptical profile distributes thrust loads uniformly during thermal expansion, reducing localised pressure and minimising the risk of piston collapse.

Features

Forged construction for enhanced structural integrity
Elliptical design ensures uniform load distribution under heat expansion
Promotes efficient heat transfer from combustion chamber to cylinder walls
Manufactured in Germany

Specifications

Bore Size: 86mm (85.92mm)
Display: 398 cm³
Stroke: 70.00 mm
Clearance: 0.08 mm
Compression Height: 35.00 mm
Compression Ratio: 2-stroke (Wossner and OEM)

Cross-Reference OEM Part Numbers

Piston Kit: 8264D100
Lock: CW18
Pin: WP042
Ring Set: RSC8600 x2
Part No.: 56-W550_1.00.WO

Vehicle Fitments

Yamaha YZ400 1977
Yamaha YZ400 1978
Yamaha IT425 1977
Yamaha IT425 1978

Vehicle Compatibility

Please check the exact model and year before ordering.

Manufacturer	Model	Years
YAMAHA	YZ 400	1977-1978
YAMAHA	IT 425	1977-1978

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.