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Yamaha DT400 Parts

Find Yamaha DT400 parts for fork sealing, clutch wear and fuel-tap replacement. Fork-seal sizes differ between 1975–1978 and 1979; the featured clutch plate lists 1977–1979 and the fuel tap 1975–1976. Use the repair links below to match the fitted assembly.

Need a different model? Yamaha DT Motorcycle Parts.

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Yamaha DT100 DT125 DT400 DT250 Fuel Petcock Assembly 498-24500-00

Yamaha DT100 DT125 DT400 DT250 Fuel Petcock Assembly - Replaces Yamaha OEM 498-24500-00

$65.64
20-0090
Motorcycle Air Filters, Petcocks & Fuel Parts Motorcycle Petcocks, Fuel Taps & Adaptor Plates Yamaha DT Motorcycle Parts Yamaha DT100 Parts Yamaha DT125 Parts Yamaha DT175 Parts Yamaha DT250 Parts Yamaha DT360 Parts Yamaha DT400 Parts Yamaha Motorcycle Parts Yamaha XT Motorcycle Parts Yamaha XT500 Parts
Yamaha DT100 DT125 DT400 DT250 Fuel Petcock Assembly - Replaces Yamaha OEM 498-24500-00. This fuel petcock controls fuel flow from the tank to the...
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About the Yamaha DT400

Match DT400 fork-seal dimensions, clutch years and the original fuel-tap arrangement.

Yamaha Motorcycle Logo

Yamaha introduced the DT400 in its 1975 product range. For a motorcycle restored with parts from different years, identify the fork, engine and fuel tank before building the order. The frame’s year remains useful, but it cannot identify a replacement assembly on its own.

Measure the original fork seal before ordering

The fork seals provide a clear size check: the 1975–1978 listing specifies 34 × 46 × 10.5 mm, while 1979 specifies 36 × 48 × 10.5 mm. The clutch plate covers 1977–1979 and the fuel tap 1975–1976. Keep those narrower applications attached to the relevant repair.

Know your model before choosing partsYamaha DT400 repair checkpoints

Use the complete model, year and fitted assembly. Each product has its own application and package contents.

1975–1978 fork application

The earlier seal listing is 34 × 46 × 10.5 mm. Compare the original seal and fitted fork.

1979 fork application

The later listing is 36 × 48 × 10.5 mm. Do not choose the earlier seal simply because both products mention DT400.

Clutch and fuel service

The featured friction plate lists 1977–1979; the fuel tap lists 1975–1976. Those separate applications do not extend each other.

Identify your model before orderingYamaha DT400 identification checklist

Use the identification on your machine and the component being repaired.

  1. Record the motorcycle’s model year and engine identity.
  2. Measure the old fork seal and check fork markings if the front end has been changed.
  3. For fuel-tap replacement, compare tank mounting, outlet orientation and the installed tap.
Need help identifying your application?

Contact PartsNMore with the complete model, year and clear photos of the identification and original part.

Yamaha DT400 parts for repairs & restoration

Choose a repair below, then confirm the product’s model and year. These examples do not change with the year filter.

Restoring or customizing your Yamaha DT400?

For DT400 handlebars, grips or mirrors, compare the actual mounts and check full steering clearance. Changes to the tank or front end can affect control routing and accessory fit.

Universal parts require measurement and are not a confirmed Yamaha DT400 fit.

PartsNMore support for your Yamaha DT400 repair

PartsNMore has supplied parts since 2002. About PartsNMore.

Read customer reviews

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Application questions

Have your model, year and original-part details ready. Ask the parts team.

Yamaha DT400 parts questions

Are 1979 DT400 fork seals the same as 1975–1978 seals?
The current listings specify different sizes: 34 × 46 × 10.5 mm for 1975–1978 and 36 × 48 × 10.5 mm for 1979. Compare the original seals and fitted fork before ordering.
Does the featured DT400 clutch plate cover 1975–1976?
The linked friction plate lists DT400 1977–1979. That application does not confirm 1975–1976. Identify the engine and clutch before selecting plates for an earlier motorcycle.
Can I order the featured DT400 fuel tap for 1977–1979?
The featured fuel-tap listing covers 1975–1976. It does not establish later-year fitment. Compare the tank mounting and original tap with an explicit application.
What if my DT400 has forks from another motorcycle?
Identify the fitted fork and use its dimensions and service-part application. The DT400 frame year alone cannot identify seals for a replacement front end.

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