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Yamaha RD400 Parts

Yamaha RD400 parts for engine sealing, fork repairs and brake service. Find gasket sets, oil-seal kits and brake pads, with separate fork-seal applications for 1976–1978 and 1979–1980. The guide below explains the repair choices and later RD400F differences.

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Yamaha RD400 XJ1100 XS1100 Friction Pads 3J6-W0045-01

Yamaha RD400 XJ1100 XS1100 Friction Pads - Replaces Yamaha OEM 3J6-W0045-01

$31.08
29-3523
Motorcycle Brake Pads, Shoes & Shoe Springs Vintage Motorcycle Brake Parts & Rebuild Kits Yamaha Motorcycle Parts Yamaha RD Two-Stroke Motorcycle Parts Yamaha RD400 Parts Yamaha XJ Motorcycle Parts Yamaha XJ1100 Parts Yamaha XS Motorcycle Parts Yamaha XS1100 Parts
Yamaha RD400 XJ1100 XS1100 Friction Pads - Replaces Yamaha OEM 3J6-W0045-01. This brake-pad set provides the friction material for the disc brake caliper and...
Sold out
Yamaha RD350 RD400 XS500 SRX250 Front Friction Pads 306-25811-05

Yamaha RD350 RD400 XS500 SRX250 Front Friction Pads - Replaces Yamaha OEM 306-25811-05

$24.05
29-3508
Motorcycle Brake Pads, Shoes & Shoe Springs Vintage Motorcycle Brake Parts & Rebuild Kits Yamaha Motorcycle Parts Yamaha RD Two-Stroke Motorcycle Parts Yamaha RD250 Parts Yamaha RD350 Parts Yamaha RD400 Parts Yamaha SRX Motorcycle Parts Yamaha SRX250 Parts Yamaha TX Motorcycle Parts Yamaha TX500 Parts Yamaha TX750 Parts Yamaha XS Motorcycle Parts Yamaha XS500 Parts
Yamaha RD350 RD400 XS500 SRX250 Front Friction Pads - Replaces Yamaha OEM 306-25811-05. This front brake-pad set provides the friction material for the disc...
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Yamaha RD350 RD400 XS500 RD250 Caliper Rebuild Kit

Yamaha RD350 RD400 XS500 RD250 Caliper Rebuild Kit

$36.11
29-0019
Motorcycle Brake Caliper Rebuild Kits & Seals Vintage Motorcycle Brake Parts & Rebuild Kits Yamaha Motorcycle Parts Yamaha RD Two-Stroke Motorcycle Parts Yamaha RD250 Parts Yamaha RD350 Parts Yamaha RD400 Parts Yamaha TX Motorcycle Parts Yamaha TX500 Parts Yamaha TX750 Parts Yamaha XS Motorcycle Parts Yamaha XS500 Parts
Yamaha RD350 RD400 XS500 RD250 Caliper Rebuild Kit. This brake-caliper rebuild kit renews the caliper piston seals and related service pieces to restore hydraulic...
In stock
Yamaha RD350 RD400 XS500 RD200 Brake Lever 1J3-83922-10

Yamaha RD350 RD400 XS500 RD200 Brake Lever - Replaces Yamaha OEM 1J3-83922-10

$7.33
08-0026
Motorcycle Brake Levers, Pivots & Adjusters Vintage Motorcycle Brake Parts & Rebuild Kits Yamaha Motorcycle Parts Yamaha RD Two-Stroke Motorcycle Parts Yamaha RD125 Parts Yamaha RD200 Parts Yamaha RD350 Parts Yamaha RD400 Parts Yamaha TX Motorcycle Parts Yamaha TX500 Parts Yamaha TX650 Parts Yamaha TX750 Parts Yamaha TZ125, TZ250, TZ350 & TZ750 Parts Yamaha TZ250 Parts Yamaha TZ350 Parts Yamaha XS Motorcycle Parts Yamaha XS500 Parts
Yamaha RD350 RD400 XS500 RD200 Brake Lever - Replaces Yamaha OEM 1J3-83922-10. This brake lever operates the front master cylinder or cable-actuated brake mechanism...
In stock
Yamaha RD400 XS400S Friction Pads 3J6-W0045-01

Yamaha RD400 XS400S Friction Pads - Replaces Yamaha OEM 3J6-W0045-01

$31.08
29-3523
Motorcycle Brake Pads, Shoes & Shoe Springs Vintage Motorcycle Brake Parts & Rebuild Kits Yamaha Motorcycle Parts Yamaha RD Two-Stroke Motorcycle Parts Yamaha RD400 Parts Yamaha XS Motorcycle Parts Yamaha XS400 Parts Yamaha XS400S Parts
Yamaha RD400 XS400S Friction Pads - Replaces Yamaha OEM 3J6-W0045-01. This brake-pad set provides the friction material for the disc brake caliper and rotor....
Sold out
Yamaha RD400 Caliper Piston 50.5 x 17

1976-78 Yamaha RD400 Caliper Piston - 50.5 x 17

$36.11
29-0518
Motorcycle Brake Caliper Rebuild Kits & Seals Vintage Motorcycle Brake Parts & Rebuild Kits Yamaha Motorcycle Parts Yamaha RD Two-Stroke Motorcycle Parts Yamaha RD400 Parts
1976-78 Yamaha RD400 Caliper Piston - 50.5 x 17. This brake-caliper piston fits the matching front or rear brake caliper when piston size, seal...
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Yamaha RD350 RD400 XS500 RD250 Caliper Piston 48 x 17

Yamaha RD350 RD400 XS500 RD250 Caliper Piston - 48 x 17

$36.11
29-0518
Motorcycle Brake Caliper Rebuild Kits & Seals Vintage Motorcycle Brake Parts & Rebuild Kits Yamaha Motorcycle Parts Yamaha RD Two-Stroke Motorcycle Parts Yamaha RD250 Parts Yamaha RD350 Parts Yamaha RD400 Parts Yamaha TX Motorcycle Parts Yamaha TX500 Parts Yamaha XS Motorcycle Parts Yamaha XS500 Parts
Yamaha RD350 RD400 XS500 RD250 Caliper Piston - 48 x 17. This brake-caliper piston fits the matching front or rear brake caliper when piston...
Sold out
Yamaha RD400 Caliper Rebuild Kit

1976-78 Yamaha RD400 Caliper Rebuild Kit

$36.11
29-0019
Motorcycle Brake Caliper Rebuild Kits & Seals Vintage Motorcycle Brake Parts & Rebuild Kits Yamaha Motorcycle Parts Yamaha RD Two-Stroke Motorcycle Parts Yamaha RD400 Parts
1976-78 Yamaha RD400 Caliper Rebuild Kit. This brake-caliper rebuild kit renews the caliper piston seals and related service pieces to restore hydraulic brake function....
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About the Yamaha RD400

Engine sealing and the later fork changes are key parts decisions on an RD400 restoration.

Yamaha Motorcycle Logo

Yamaha’s RD400 is an air-cooled two-stroke road twin. The U.S.-market 1979 RD400F Daytona Special brought changes to the cylinder head, carburetor controls, forks and brakes. Its 35 mm fork tubes differ from the earlier 34 mm arrangement, making the fitted front end a useful starting point for identification.

Separate the engine repair from the chassis year split

The engine gasket set below lists RD400 1976–1980, but the featured engine oil-seal kit lists 1976–1978. Fork seals also divide into early and later applications. Keep the individual product’s years with the job, especially on an imported bike or one with replacement forks.

Model and year comparisonRD400 parts differences

RD400 fork and engine-sealing applications
PartYears listedSelection detail
Fork oil seals1976–197827-1016: 34 × 46 × 10.5 mm
Fork oil seals1979–198027-1007: 35 mm fork application
Engine oil-seal kit1976–197801-9022 engine oil-seal kit
Engine gasket set1976–198018-0238 engine gasket set

Prepare for the repairIdentify your RD400 components

Early front end or later RD400F equipment

The U.S. 1979 F changed from 34 mm to 35 mm fork tubes and also changed the calipers and mounts. Match the fitted fork and brake parts separately; the table’s later catalog range is not a claim that all markets used identical equipment.

Gasket joint or oil-seal location

A gasket seals between mating engine surfaces. An oil seal works around its specified shaft or housing location. Identify the leaking location before choosing a set, and compare the exact contents when the engine is already apart.

Have a part you cannot identify?

Contact PartsNMore with your model, year and clear photos of the part and its markings.

Yamaha RD400 parts for repairs & restoration

Choose the job, then use the stated model and years. The repair guide covers more than one year; product examples do not change with the year filter.

Handlebars, mirrors and custom controls

For an RD400 with replacement bars, rearsets or mirrors, check steering clearance and the existing cable routing before choosing universal accessories. A period appearance does not confirm mounting dimensions.

Universal accessories require measurement and may need modification; they are not confirmed direct-fit RD400 parts.

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Unused, unaltered parts; original packaging required. Electrical parts excluded. Return conditions.

Yamaha RD400 parts questions

Do early and later RD400 models use the same fork seals?
The featured applications differ: 27-1016 lists 1976–1978 with 34 × 46 × 10.5 mm dimensions; 27-1007 lists 1979–1980 for the 35 mm fork application. Match the actual fork and all seal dimensions.
What changed on the U.S. 1979 RD400F Daytona Special?
Useful repair distinctions include 35 mm forks, revised brake calipers and a linked carburetor throttle mechanism. Use these with the model code and market information when identifying replacement assemblies.
Can I use the featured early RD400 oil-seal kit on a 1979 model?
Kit 01-9022 lists RD400 1976–1978. It does not establish 1979 fitment. The separate gasket set’s 1976–1980 application cannot be used to extend the oil-seal kit’s years.
What should I inspect before fitting new RD400 fork seals?
Inspect the tube surfaces for rust pits, nicks and damage, and assess bushing wear. Compare the old seal’s dimensions and the fitted fork with the replacement. A damaged running surface can cause a new seal to leak.

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