dual exhaust factory kit

[belmont]

In clearing out old stuff in my collection I found what I think is the hardware from one of Harley's dual exhaust kits in the early 60's. This all came in the cloth bag years ago. The bolts are bright zinc plated "1038 CP", the clamp was very rusted but also bright zinc plated like the other smaller clamp. That smaller clamp is maybe the one for the front pipe to attach to the frame.
I believe that Harley had to change to zinc plating around 1956 because Cadmium plating was too toxic. In my collection the bright zinc plated bolts were from the early 60's and newer. The late 50's hardware was a bit duller zinc plated.

My question is this: Is that rear pipe clamp the 65510-54 for rigid frames or is it the 65510-61 for swingarm frames?

Also what is the double ended stud for? I have another pair of that same stud that chrome plated and never figured out what they used on.

I know that the special head 9/16" bolt is for rigid frame bikes to attach the muffler clamp, but what is the cad plated bracket for?

Thanks in advance for anything I get on this.

belmont

[Saddletramp]

Belmont,
I have both of those clamps, both very rusted, and the one on the right with the longer mounting tab looks identical to my original from my 1960.
The one with the shorter mounting tab or on the left, I believe to be for '54 to '57.
As far as I can tell, the '61 and up rear pipe clamp has a tab with an open end where it connects to the rear cylinder stud rather than a closed loop.
The open ended tab shows in my parts book.
I believe V-Twin repro'd one or both of them in Cad and or Zinc.
I intend to blast the heck out of my original and parkerize it. I will probably use zinc phosphate since you mentioned the zinc and that rings a bell somehow.

Can't help with the cad bracket. The stud that's park'd looks familiar but I can't place it.

James

[Rubone]

Karel, the double ended stud is for the seat springs to space the left side out to clear the pipe. The cad bracket is to lower the brake line on a swingarm frame.

[sw48]

Belmont, here is a photo of a NOS 65510-61 exhaust clamp:
IMG_2460.jpg

[belmont]

James, My rear pipe clamp was VERY heavily rusted, so I soaked it in the citric acid/baking soda rust remover solution that I started using this year. Discovered it on YouTube, it is fairly benign to use and it doesn't adversely affect chrome plated parts. With this part I found that it does remove the zinc plating when you leave it in the solution for 7 hours. It takes at least 4 hours of soaking to get most of the rust off anything that I have tried it on. It is cheap to make and stores in a plastic jug safely. I got around 7 uses out of the first batch I made before it died and wouldn't do anything.
You should try it out, saves a lot of time in surface prep for paint.

Belmont

[belmont]

Thanks Robbie, I thought maybe the cad bracket might be for the left side muffler clamp on the rigid frames. That 9/16" bolt with the slightly domed head fits the bracket and the holes in my rigid frames by the rear axle are the same size.
What is that zinc plated , I assume, frame tube clamp with the skewed bolt tab for?
I have come to believe that I have a catch all group of parts for different assemblies and I appreciate all the help in identifying what I have.
I don't follow how that double ended stud works with the buddy seat springs.

Karel

[belmont]

SW48, thanks for the photo of the 65510-61. Mine doesn't have the bend in the tab for the cylinder base stud, so maybe it is from V-Twin back in the day. The zinc plating on it was a perfect match for the bolts, Triumph tyre size 1038 CP. My 68 parts book shows that those Triumph tyre size were for kits up to 1961, after that they switched to using Looking For Touch Up Paint, Red

Belmont

[belmont]

Apparently I can't use the old pound/number symbol to signify a part number. The bolts I referred to are part number 3996 supplied in the dual exhaust kits up to 1961 and after that Harley supplied them with part number 4000.

Lesson learned, belmont