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400 F2 rear Brake torque arm

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exvalvesetdabbler:

My curiosity has got the better of me again.

Is there a difference in the torque arm between the F1 and F2 , noticed this when cleaning one up where it has F2 stamped on one end.

I put some zinc on this as the last job before discarding the zinc plate bath and as I suspected a lot of muck came out of the insides of it. 


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What are people doing to refinish these?  seems too heavily pitted to polish and lacquer.  The one currently on the bike got red oxide and engine enamel (just whatever was sitting on the shelf at the time) and it seems to have held up so far?

Regards
Dave

Oddjob:
Just a production mark, loads of them around if you know where to look. The holes in the back and front of the arm block up and the tube rusts from the inside as a result. If you shake one you can normally hear it making a sound like a maraca, unblock the holes with a drill and you can get the majority of it out by shaking and knocking it on something, I filled mine with zinc paint and Waxoyl to stop it doing it again.

That's pretty badly corroded, I'd see if I could find a better one if I was you. I've had them chromed, lasted but needed constant polishing, polished and even had my last one done in ceramic chrome. Some people paint or powder coat them as well.

taysidedragon:
I painted mine in satin black to match the swingarm.

Mikep328:
I'd just clean it up/paint it black. Who's going to notice it's not a pristine surface?  You can't really see it unless you are down on your knees with a light specifically to look at it!  :)

Of course, if you are wanting it to be concours/look like a new bike for sales purposes, that's a different thing. 

Oddjob:
It wasn't the finish you'd get that concerned me Mike, it was the corrosion, is it worse inside for instance, is there a chance it can break and cause the brake plate to rotate under braking causing a possible off. I had a good swinging arm that I decided to throw away as the surface finish was similar to that, for the cost of one I'd buy another.

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