RD350 and RD400 front fork tubes

[Still biking]

Are the RD350 and RD400 front fork tubes the same?

[Yamaha 179]

No they are not.  While they are similar sizes there are significant differences.  I have never attempted to replace one with the other.  I think that if you had the entire fork tube it might work but I am not sure.  The bottom of the tubes are shaped a bit differently and I don't know how that would impact the operation of the unit.  You could always try it and see but I would suggest you try both legs and not just one.
Lyn Garland

[Still biking]

thanks!