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1975 Yamaha MX400B

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Devin
May 9, 2024

Site Admin.

1975 Yamaha MX400B Page

Welcome to the 1975 Yamaha MX400B Forum. The factory Yamaha color was called "White W/Competition Yellow". The USA Vin Range was 510-000101 to 009096. Feel free to post anything related to this model in the category. Anything new, will be added to this section. If you see any errors, please contact me privately.

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1975 Yamaha MX400B


The 1975 Yamaha MX400B Owner's Manual is located: CLICK HERE

The 1975 Yamaha MX400B Assembly Manual is located: CLICK HERE


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ryon.weidnerryon.weidner

front forks

I am looking for a set of forks, or a new set of inner fork tubes. DC plastic has a few sizes, but none that i can verify are correct.

Does anyone have any other recommendations.

Dos anyone know the size of the inner fork tubes?

thanks


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Devin
Devin
Sep 14
•

Welcome to the site! The fork tubes for the 1975 Yamaha MX400B are 34MM.

There are companies that can replate the hard chrome on the originals. Below is one business that does so.


Allen Industrial Hard Chroming

951-849-4966

Edited
Devin
August 23, 2025

Site Admin.

1975 Yamaha MX400B Yamaha MX250B Vintage two stroke motocross


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Devin
June 5, 2024

Site Admin.

1975 Yamaha MX400B Parts

Any parts for the 1975 Yamaha MX400B will be added here.


Decompression Valve Cover 275-12278-00-00 Yamaha RT1 RT2 RT3 DT360A DT400B/C
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