what exhaust nuts for my roadster?

unfortunately I have to change the exhaust nuts of my Commando Roadster 750 year 1973 and I was wondering what kind I should take for them..

those which came with my bike (not sure if original) had small round fins with three integral lugs (and I believe they were in brass), but I have read old britts suggests the later type generally mounted on the 850s with beefier lugs, but with less thread than the former type..

which are original for my 750 year 1973? which are best to mount and why?

thanks for helping!

I like the bronze ones from Walridge or Norvil. They have 3 thick lugs so I can always find a thick lug to put my tool on. I never much cared for the longer looking ones, but don't know if you have to use those on the later bikes?


Dave
69S

thank you Dave..
here below are those I had on my bike (which I broke a fin.. (
and also the later type with longer lugs..

now, what is original for a 750 roadster in the year 1973? .. and if perhaps I should switch with the later type as OldBritts suggests (with shorter threads), anyone knows the reason?

http://www.oldbritts.com/nor_comm_73_24.html

I'm not clear on which is for which year, I only know the early ones. At least OB has the years broken out. The one on the right in your pictue is the early years.

Dave
69S

I just put on a set from Commando Specialtes. The come with a pin spanner and are very easy to tighten and are very well made.

I like these for the nice transition from the amber pipes to the EasyOff accented head. Yes, yes, live and learn!

The chrome skinny finned short thread nuts were for the new headpipes with balance tube, starting with the 73 850. The 750s had the longer threads.

Dave's right. I had the "shallower" ones on my 850 (with balance pipe) originally, but switched to 750 style longer--threaded ones when I replaced the OEM exhaust system with an "unbalanced" one made for 750s.

The 850 nuts have fewer threads due to the thickness of the collets needed to hold the pipes in place, since there's no way to slide the nut over the 'Y' of the balanced pipes.

The 'advantage' of balanced pipes is freer flow of exhaust gases, with a bit of scavenging action from one side to the other, and generally quieter exhaust, because each pulse is traveling through 2 mufflers.

The disadvantage of balanced pipes is the loss of 3 or 4 threads to hold the pipe in the head, and greater potential for stripping the threads, leading to a repair of the exhaust threads down the road.

I put the balanced pipes on my 850, then replaced them with 750-style pipes and nuts after cracking 2 headers at the 'Y' in the space of about 1000 miles. My bike came with the balanced pipes, and 2 stripped port threads.

I have these one on my far from stock Commando:

Stainless Steel Exhaust Nuts for Norton Commando**NEW**
eBay : 310379997884

Philippe