Balanced Exhaust==>Un-Balanced Swap?

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o0norton0o said:
If you use the search function here, there seems to be a difference in sealing washers too. The worst thing you could do is bottom out the rose nuts and NOT have sufficient pressure on the flange of the exhaust pipe. Then the pipe will hammer away at the rose nuts and screw up the threads in the head. I've only owned a 750, so if you assemble the new exhaust and something seems amiss, you may need to check further into the differences...
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When I threaded in an old nut without pipe, the fins went all the way into contact point with head. With pipe and steel washer, nut leaves a small gap between fins and head and the pipe cannot be wiggled by hand. So I believe it's got enough force on flange.
 
Tornado said:
I did attempt to fit a new nut without pipe just see how they went...but it just slide right into bore fully.
Oh, one other point I have not seen in other rose nut threads...my old ones are left hand thread. And the single wide lug fin actually has "L.H." stamped on it. Is that usual?
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wow.... all the ones ive seen are RH thread. somebody has been into the motor..
 
Tornado said:
I did attempt to fit a new nut without pipe just see how they went...but it just slide right into bore fully.
Oh, one other point I have not seen in other rose nut posts...my old ones are left hand thread. And the single wide lug fin actually has "L.H." stamped on it. Is that usual?
Click to expand...

No... you must have some form of over size nut, what does the rose look like ?

I guess with one left and one right hand nut, the Feng shui would be good.
 
Agreed. Not normal. Sounds like the exhaust threads got knackered and they were bored out and rethreaded for custom Rose's.
 
Time Warp said:
No... you must have some form of over size nut, what does the rose look like ?

I guess with one left and one right hand nut, the Feng shui would be good.
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Here they are:

Balanced Exhaust==>Un-Balanced Swap?
Balanced Exhaust==>Un-Balanced Swap?


So it seems I have a head with a custom repair and un-obtanium rose nuts! Pity, they are looking quite ratty and the RGM steel are really beautys, Eh!
 
Time Warp said:
No... you must have some form of over size nut, what does the rose look like ?

I guess with one left and one right hand nut, the Feng shui would be good.
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Both old ones are left hand threaded....and we all know such Dextor things are the work of the Devil!
 
when i saw the crack in the left pipe on monday it looked like it followed the weld part way around. and it did not look it had been repaired. you may want to post a picture of the crack so that LAB or one of the longer owners can cast their eye on it . its not uncommon for cracks to develop beside a weld, i just have not seen any on a norton exhaust before to be able to confirm that this is where they normally fail.

with good prep, it can be repaired.
then i would plan a head dismount and a trip to Jim Comstock for a exhaust thread repair... in the future
 
Tornado said:
Oh, one other point I have not seen in other rose nut posts...my old ones are left hand thread. And the single wide lug fin actually has "L.H." stamped on it. Is that usual?
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Do fish sing?

Are you sure would you confirm direction of rotation to tighten CW or CCw?
 
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Never heard of LH thread on an exhaust rose !
And there would be no point to it either
It's really odd
 
baz said:
Never heard of LH thread on an exhaust rose !
And there would be no point to it either
It's really odd
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Lost in the mysteries of time. Who knows, perhaps shop that did it only had a LH tap and/or next size up rose nuts were only available as LH.
What other bikes could these have come from?
Beginning to suspect a Southern hemisphere source...things seem to work backward/upside down there.
 
Esmerela said:
How strange, from the abuse marks on the rose nuts shown in your photos they look to have been beaten in the conventional direction.
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But no way to tell if beating was for tightening or loosening, Eh!
 
Esmerela said:
How true.
Good luck in your quest for LHT rose nut.
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Well I guess I will need to keep these ratty ones for quite some time to come....I see no overriding need for getting the head machined at this time.
 
Tornado said:
Well I guess I will need to keep these ratty ones for quite some time to come....I see no overriding need for getting the head machined at this time.
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That's what I would do. You've seem to have found a new source for Norton annoyance.
Back to the header pipe. The port configuration of the pipe will decide what type of sealing/washer system to use.
If it is the bell shape, you should use the Mark 3 conical washers with the collets.

If it's not, you'll probably need to double up the Copper/Steel washers to allow for the shorter 5/8" thread.
There is a recent thread on here about that.

https://www.accessnorton.com/NortonCommando/mk3-head-rh4-require-spherical-seat-and-collet.27623/
 
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MichaelB said:
That's what I would do. You've seem to have found a new source for Norton annoyance.
Back to the header pipe. The port configuration of the pipe will decide what type of sealing/washer system to use.
If it is the bell shape, you should use the Mark 3 conical washers with the collets.

If it's not, you'll probably need to double up the Copper/Steel washers to allow for the shorter 5/8" thread.
There is a recent thread on here about that.

https://www.accessnorton.com/NortonCommando/mk3-head-rh4-require-spherical-seat-and-collet.27623/
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Replacement pipes are from a 750 I believe. They have right angled flat flanges.
So with my bastardized rose nuts, the pipes are held quite firmly with just a single steel (rgm) seal ring. There is a visible gap with rose nut fins away from head. With just nut alone, there is no gap. So I'm confident setup is not bottomed out, pipes not loosely held. If needed, I will add another sealing ring later.
Going for first engine startup today to see how she goes. Note I still have the muted peashooters installed...so will see what effect no balance pipe gives.
 
Tornado said:
Replacement pipes are from a 750 I believe. They have right angled flat flanges.
So with my bastardized rose nuts, the pipes are held quite firmly with just a single steel (rgm) seal ring. There is a visible gap with rose nut fins away from head. With just nut alone, there is no gap. So I'm confident setup is not bottomed out, pipes not loosely held. If needed, I will add another sealing ring later.
Going for first engine startup today to see how she goes. Note I still have the muted peashooters installed...so will see what effect no balance pipe gives.
Click to expand...
You know they have to be RFT, right?
 
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