Name: Piston Kit 40mm 1981-2021 Yamaha PW50 18U-11631-00-A0
Brand: Dirt Racing
SKU: 56-W938+000.DR

Piston Kit 40mm 1981-2021 Yamaha PW50 18U-11631-00-A0

Dirt Racing
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Description

This piston kit is a standard replacement designed for the Yamaha PW50 and various Yamaha 50cc models from 1979 to 2021. It provides precise fitment and durability for small two-stroke engines, matching or exceeding OEM specifications.

Features

Constructed from high-tech materials for long-lasting performance and reliability
Elliptically designed for consistent bearing surface under thermal expansion
Direct OEM replacement for easy installation
Includes all necessary components for complete piston replacement
Manufactured to meet or exceed OEM quality standards

Specifications

Piston Diameter: 40mm
Piston Height: 50mm
Piston Pin Length: 33mm (1.29")
Piston Pin Outer Diameter: 10mm

Package Included

1 x Piston
2 x Piston Rings
1 x Piston Pin
1 x Small End Bearing
2 x Circlips

Cross-Reference OEM Part Numbers

PROX 01.2005.000
Piston (Std): 18U-11631-00-A0, 4J2-11631-00-A0
Piston Pin: 3L5-11633-00-00
Piston Ring Set (Std): 260-11610-04-00, 260-11601-03-00
Circlip: 93450-11021-00

Vehicle Fitments

Yamaha PW50 (1981–2021)
1982 MJ50J
1979 QT50F
1980 LC50G
1980 QT50, QT502G, QT50G
1981 PW50H, QT50H
1982 PW50J, QT50J
1983 PW50K, QT50K
1984 YAMAHOPPER (QT50L)
1985 Y-ZINGER (PW50N), YAMAHOPPER (QT50N)
1986 Y-ZINGER (PW50S), YAMAHOPPER (QT50S)
1987 Y-ZINGER (PW50T), YAMAHOPPER (QT50T)
1990–2021 Y-ZINGER / PW50 (PW50A to PW50M2, including all suffix variants)

Vehicle Compatibility

Please check the exact model and year before ordering.

Manufacturer	Model	Years
YAMAHA	QT 50	1979-1987
YAMAHA	PW 50	1981-2021
YAMAHA	QT 50	1979-1992
YAMAHA	SG 50	1981-1983
YAMAHA	MJ 50	1982
YAMAHA	LC 50	1980-1981

Piston Kit 40mm 1981-2021 Yamaha PW50 18U-11631-00-A0

Dirt Racing
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This piston kit is a standard replacement designed for the Yamaha PW50 and various Yamaha 50cc models from 1979 to... Read more

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SKU: 56-W938+000.DR

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Description

This piston kit is a standard replacement designed for the Yamaha PW50 and various Yamaha 50cc models from 1979 to 2021. It provides precise fitment and durability for small two-stroke engines, matching or exceeding OEM specifications.

Features

Constructed from high-tech materials for long-lasting performance and reliability
Elliptically designed for consistent bearing surface under thermal expansion
Direct OEM replacement for easy installation
Includes all necessary components for complete piston replacement
Manufactured to meet or exceed OEM quality standards

Specifications

Piston Diameter: 40mm
Piston Height: 50mm
Piston Pin Length: 33mm (1.29")
Piston Pin Outer Diameter: 10mm

Package Included

1 x Piston
2 x Piston Rings
1 x Piston Pin
1 x Small End Bearing
2 x Circlips

Cross-Reference OEM Part Numbers

PROX 01.2005.000
Piston (Std): 18U-11631-00-A0, 4J2-11631-00-A0
Piston Pin: 3L5-11633-00-00
Piston Ring Set (Std): 260-11610-04-00, 260-11601-03-00
Circlip: 93450-11021-00

Vehicle Fitments

Yamaha PW50 (1981–2021)
1982 MJ50J
1979 QT50F
1980 LC50G
1980 QT50, QT502G, QT50G
1981 PW50H, QT50H
1982 PW50J, QT50J
1983 PW50K, QT50K
1984 YAMAHOPPER (QT50L)
1985 Y-ZINGER (PW50N), YAMAHOPPER (QT50N)
1986 Y-ZINGER (PW50S), YAMAHOPPER (QT50S)
1987 Y-ZINGER (PW50T), YAMAHOPPER (QT50T)
1990–2021 Y-ZINGER / PW50 (PW50A to PW50M2, including all suffix variants)

Vehicle Compatibility

Please check the exact model and year before ordering.

Manufacturer	Model	Years
YAMAHA	QT 50	1979-1987
YAMAHA	PW 50	1981-2021
YAMAHA	QT 50	1979-1992
YAMAHA	SG 50	1981-1983
YAMAHA	MJ 50	1982
YAMAHA	LC 50	1980-1981

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.