Exhaust port repair

I don't post much here anymore, but I'll jump in to say that Comnoz fixed my exhaust threads a long time ago,
working his magic with bronze inserts.
Everything is still tight.
Highly recommended!
 
jan nelder said:
Seager engineering in Essex/Suffolk , UK do a vg bronze insert, threaded into head, and some matching exhaust collars to screw in. Just plan ahead, as they are very busy!! They have a facebook page which has lots of great pics of what they do 5 days a week.
Click to expand...
I follow Seager on Facebook, and some of the stuff Pat does (saves) is nothing short of miraculous.
 
Some years ago,someone (I can't remember his name) was advertising in INOA Norton News. He would make stainless steel oversize exhaust nuts. They were 2 inches dia. instead of the standard 1 15/16. They woud stay in place with an allen screw against the port side. Shiny and beatiful made!
 
Sergio said:
Some years ago,someone (I can't remember his name) was advertising in INOA Norton News. He would make stainless steel oversize exhaust nuts. They were 2 inches dia. instead of the standard 1 15/16. They woud stay in place with an allen screw against the port side. Shiny and beatiful made!
Click to expand...
Personally I would stick to standard size. Colorado sells the Stainless steel ones which requires a special tool to tighten them. https://coloradonortonworks.net/part-categories/cnw-special-tools.html
I have these on my personal MK111 and really like the look.
 
I think it was "Schults" (sp) that had made the over size exhaust rings. He also made the one piece rocker shaft covers.
 
Dzldanz said:
Personally I would stick to standard size. Colorado sells the Stainless steel ones which requires a special tool to tighten them. https://coloradonortonworks.net/part-categories/cnw-special-tools.html
I have these on my personal MK111 and really like the look.
Click to expand...
That would be George Scholtz.

CH53MechWest

Thread 'George Scholtz Nuts'

Hello,

I am looking for George Scholtz exhaust nuts. for a 1974 850 Commando that I am putting together. If anyone has a set please call me at 413 561 7575

Ken
 
Can I ask you advice on how to avoid having exhaust thread problems? On my 850, I put some copper never-seize on the threads and tighten then use a maul to whack it hard. Then retighten a month or two later.
Last summer I had a nut come loose while riding. Luckily I heard a strange exhaust note, stopped, noticed the nut almost unscrewed to falling off. I spun it back hand tighten with my gloves on and rode home. Then tightened
Thanks
Dennis
 
This is probably a bit like an oil thread but...
I never use any compound on the threads - my rationale being if the lube helps it tighten, it'll also help it loosen.
I have a two foot length of pipe that fits nicely over the rose spanner. For final tightening I ensure the head is good and warm then apply tightening pressure with the engine running.
Vibes plus heat seems to work - they stay tight.
I also check for looseness (hot or cold) every month or so, just in case.

I never lube spark plugs either - same reason
Cheers
 
DennisMo said:
Can I ask you advice on how to avoid having exhaust thread problems? On my 850, I put some copper never-seize on the threads and tighten then use a maul to whack it hard. Then retighten a month or two later.
Last summer I had a nut come loose while riding. Luckily I heard a strange exhaust note, stopped, noticed the nut almost unscrewed to falling off. I spun it back hand tighten with my gloves on and rode home. Then tightened
Thanks
Dennis
Click to expand...
Keep them tight. That’s the basic answer. Tight rose nuts will not allow the fretting that causes the damage.

As discussed in your other thread, tighten them as tight as you can, on a hot and running engine, and check them frequently. You will see over a number of tightenings when you are not tightening them any more, this is telling you the crush washers are compressed and things are seated.

I use copper grease on the threads, but I get Rob’s logic about not using, you’ll have to decide what you prefer in that regard.

A ‘trick’ of mine is that I hardly ever fit new crush washers. I figure that once they’re crushed, they ain’t gonna crush any more and, obviously, when a crush washer does ‘give’ and crush over time, the rose nut will then be loose.
 
I fitted these about 25,000 miles ago. No need to go super tight with them as they don’t come loose, just tight is enough. Not overly expensive, in fact cheaper than stock, and half the weight.

Alloy Exhaust Lock Ring Norton Twins

Alloy Exhaust Lock Ring Norton Twins Commando Dominator Triton Cafe Racer Caferacer
www.tga.co.uk
 
Last edited:

Similar threads

D
Norton exhaust port repairs
Replies
13
Views
1,461
Dzldanz
D
D
  • Discussion Discussion
(For Sale) Exhaust Port Repair
Replies
0
Views
399
Dzldanz
D
D
Norton Exhaust Port Repair
2
Replies
33
Views
3,989
Tornado
Tornado
MikeG
Classic British Spares Exhaust port repair
2
Replies
24
Views
3,805
Dzldanz
D
C
JS exhaust port fillers
2 3 4 5
Replies
82
Views
9,759
acotrel
acotrel
Back
Top