Name: Piston Kit 75-81 DT400 MX 85.5, Wossner 8263D050 Yamaha
Brand: Wossner
SKU: 56-W549_0.50.W0

Piston Kit 75-81 DT400 MX 85.5, Wossner 8263D050 Yamaha

Wossner
Share
- WhatsApp
- Deel
- X
- Pin it
- Messenger
- Email

Description

This Wossner piston kit features an 85.50mm bore size (85.42mm actual) and is designed for Yamaha DT400 (1975–1978) and MX410 (1975–1976) models. Manufactured in Germany, this forged piston is engineered for strength and thermal efficiency. The elliptical design supports even load distribution during expansion, reducing the risk of piston collapse by preventing localised pressure points.

Features

Forged construction for increased strength
Elliptical design ensures uniform load distribution under heat expansion
Promotes efficient combustion chamber heat transfer to cylinder walls
Made in Germany

Specifications

Bore Size: 85.50mm (85.42mm)
Display: 398 cm³
Stroke: 70.00 mm
Clearance: 0.08 mm
Compression Height: 40.00 mm
Compression Ratio: 2-stroke (Wossner and OEM)

Cross-Reference OEM Part Numbers

Piston Kit: 8263D050
Lock: CW18
Pin: WP042
Ring Set: RSC8550 x2
Part No.: 56-W549_0.50.WO

Vehicle Fitments

Yamaha DT400 1975
Yamaha DT400 1976
Yamaha DT400 1977
Yamaha DT400 1978
Yamaha MX410 1975
Yamaha MX410 1976
Yamaha DT Base 1979
Yamaha DT Base 1980
Yamaha DT Base 1981
Yamaha MX 400 1975
Yamaha MX 400 1976
Yamaha MX 400 1977
Yamaha MX 400 1978
Yamaha MX 400 1979
Yamaha MX 400 1980
Yamaha MX 400 1981

Vehicle Compatibility

Please check the exact model and year before ordering.

Manufacturer	Model	Years
YAMAHA	DT 400	1975-1978
YAMAHA	MX 400	1975-1981
YAMAHA	DT 400	1975-1981
YAMAHA	MX 400	1975-1976

Piston Kit 75-81 DT400 MX 85.5, Wossner 8263D050 Yamaha

Wossner
Share
- WhatsApp
- Deel
- X
- Pin it
- Messenger
- Email

Product form

This Wossner piston kit features an 85.50mm bore size (85.42mm actual) and is designed for Yamaha DT400 (1975–1978) and MX410... Read more

Out of stock

£0.00 Incl. VAT

Guaranteed secure & safe checkout.

SKU: 56-W549_0.50.W0

Free shipping on all orders above £75

No hassle returns within 30 days

Description

This Wossner piston kit features an 85.50mm bore size (85.42mm actual) and is designed for Yamaha DT400 (1975–1978) and MX410 (1975–1976) models. Manufactured in Germany, this forged piston is engineered for strength and thermal efficiency. The elliptical design supports even load distribution during expansion, reducing the risk of piston collapse by preventing localised pressure points.

Features

Forged construction for increased strength
Elliptical design ensures uniform load distribution under heat expansion
Promotes efficient combustion chamber heat transfer to cylinder walls
Made in Germany

Specifications

Bore Size: 85.50mm (85.42mm)
Display: 398 cm³
Stroke: 70.00 mm
Clearance: 0.08 mm
Compression Height: 40.00 mm
Compression Ratio: 2-stroke (Wossner and OEM)

Cross-Reference OEM Part Numbers

Piston Kit: 8263D050
Lock: CW18
Pin: WP042
Ring Set: RSC8550 x2
Part No.: 56-W549_0.50.WO

Vehicle Fitments

Yamaha DT400 1975
Yamaha DT400 1976
Yamaha DT400 1977
Yamaha DT400 1978
Yamaha MX410 1975
Yamaha MX410 1976
Yamaha DT Base 1979
Yamaha DT Base 1980
Yamaha DT Base 1981
Yamaha MX 400 1975
Yamaha MX 400 1976
Yamaha MX 400 1977
Yamaha MX 400 1978
Yamaha MX 400 1979
Yamaha MX 400 1980
Yamaha MX 400 1981

Vehicle Compatibility

Please check the exact model and year before ordering.

Manufacturer	Model	Years
YAMAHA	DT 400	1975-1978
YAMAHA	MX 400	1975-1981
YAMAHA	DT 400	1975-1981
YAMAHA	MX 400	1975-1976

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.