400 F2 rear Brake torque arm

[McCabe-Thiele (Ted)]

 Thanks for the info about the first set of numbers Ken, I think 💬 the last number I put in for the 500 K1 is a typo so you are correct the middle number is 323.

Either way the torque arm on my 400NA has the same dimensions as a 400/4. Made me wonder if there is a difference in the tube thickness or steel specification.

[exvalvesetdabbler]

Holes are to clear bolt with 10mm shoulder both ends

Diameter of round section of tube   15-16mm, not perfectly round

Regards
Dave

[Mikep328]

Looking at the parts diagram it seems like this would be an easy item to fabricate with a piece of steel tubing if there was no available replacement.  Cut a piece of tube, flatten the ends appropriately, drill a couple of holes and paint it...Bob's your uncle!!

[McCabe-Thiele (Ted)]

If I am correct the CB400/4 & the CB400NA were both in production in common years, does make me wonder why the few common parts such as the brake steady bar do not use the same part number, might be a pre-computerisation era thing.

As Mike says for those with the right tools easy enough to fabricate.