S & SS mufflers

seattle##gs · Nov 25, 2020

I am trying to fit mufflers on an S model, both pipes on the left side. The pipes and mufflers are new. The mufflers have only one threaded boss welded on for the lord fitting...only one. And that one tilts toward the motor by perhaps 10 degrees (guesstimate). The big mounting bracket that bolts to the frame shock absorber bracket requires a straight in fitting. What gives? Are these muffs really for the SS model? And that one only? To make these work together would require either putting a severe bend on the lord fitting (and I would suspect it would fail quickly) or to cut and weld the existing main bracket. I am missing some information.

robs ss · Nov 25, 2020

seattle##gs said:
I am trying to fit mufflers on an S model, both pipes on the left side. The pipes and mufflers are new. The mufflers have only one threaded boss welded on for the lord fitting...only one. And that one tilts toward the motor by perhaps 10 degrees (guesstimate). The big mounting bracket that bolts to the frame shock absorber bracket requires a straight in fitting. What gives? Are these muffs really for the SS model? And that one only? To make these work together would require either putting a severe bend on the lord fitting (and I would suspect it would fail quickly) or to cut and weld the existing main bracket. I am missing some information.

Trying my best to decipher your explanation into something I can "see" - a few photos would help.

seattle##gs · Nov 26, 2020

I am unable to post pictures.
The threaded boss on the muffler I believe should be 90 degrees to the muffler. This one isn't. There is about a 10 degree tilt towards the front of the bike. It looks to be done at the factory but I can't think of any reason why. If I screw in a lord fitting into the muff I would have to bend it rearwards by about 10 degrees for it to pass through the main bracket.

trident sam · Nov 26, 2020

seattle##gs said:
I am unable to post pictures.
The threaded boss on the muffler I believe should be 90 degrees to the muffler. This one isn't. There is about a 10 degree tilt towards the front of the bike. It looks to be done at the factory but I can't think of any reason why. If I screw in a lord fitting into the muff I would have to bend it rearwards by about 10 degrees for it to pass through the main bracket.

I think you have a problem with the muffler, when I fitted S pipes there was no tilt to the front, it was all parallel.

dynodave · Nov 26, 2020

curious,
1. the muffler has a down the pipe centerline axis.
2. Then the muffler is a cone, 90 degrees off that surface, something mounted would tilt forward even though it is mounted 90 degrees from that cone surface ....
3. the 2 new (repop-origin unknown) "S" mufflers I have, the bobbin mount is 90 degrees from the cone surface.
4. are yours tipped forward from #3?

FWIW 1 set of "S" heat shield "for sale"

seattle##gs · Nov 26, 2020

I will use the term "bobbin mount"
The bobbin mount is tilted forward of the cone surface. To use these muffs and have them line up with the bracket would mean that the pipes would have a bend at the end and the muffs would then swing way out away from the bike.
Again it looks like a factory job..it was made like this on purpose. Both muffs are identical.
Does someone have a spare bracket that I could cut and weld? The one I am working with is brand new and chromed so I don't want to cut it up.
If I can't find the answer to my question I know how to solve the problem. Right now it requires quite a bit of force to bend the lord fitting or bobbin through the bracket.

dynodave · Nov 26, 2020

seattle##gs said:
The bobbin mount is tilted forward of the cone surface.

I could see the cone line being parrallel with the run of the bike. That will make the muffler center line point outward a bit.
But the bobbin mount tipped forward makes the muffler stick out that much more.
What is the results of a trial fit-up of the exhaust "kit"?

ILLF8ED · Nov 26, 2020

Here is a photo of my ‘69 750 S with new mufflers from Andover Norton. The typical threaded rubber cushion mounts bolt on one side to the hockey stick bracket. The other thread goes through a long plate that ties the mufflers together then threads into the muffler bosses (one on each muffler but should be 90 degrees to the mount).

HRD · Nov 26, 2020

seattle##gs said:
I am unable to post pictures.
The threaded boss on the muffler I believe should be 90 degrees to the muffler. This one isn't. There is about a 10 degree tilt towards the front of the bike. It looks to be done at the factory but I can't think of any reason why. If I screw in a lord fitting into the muff I would have to bend it rearwards by about 10 degrees for it to pass through the main bracket.

Hi ,do you know the maker of these mufflers ? Just a warning and what year is the bike and what size tyre/and front guard is fitted up front,because if it has a later with 4.10 tyre and guard your next problem is when the forks compress the S exhaust pipes will hit the front mud guard.

RoadScholar · Nov 26, 2020

I've not wrestled with an S exhaust, but I can tell you that very few new parts fit without some degree of fretting, only you can decide how much effort to put in or whether to return the parts before they become wall hangers and try another vendor.

Another point to consider is the health of your ISOs. If the ISOs are original or older than, say, 10 years they sag. A 1/4" sag at either or both of the ISOs will make fitting an exhaust a very frustrating, if not impossible. If your system ends up requiring a lot of muscle the stress will cause the rubber silencer mounts to have a life measured in days or weeks if you're lucky.

I feel your pain.

Best

Fast Eddie · Nov 26, 2020

illf8ed said:
Here is a photo of my ‘69 750 S with new mufflers from Andover Norton. The typical threaded rubber cushion mounts bolt on one side to the hockey stick bracket. The other thread goes through a long plate the ties the mufflers together then threads into the muffler bosses (one on each muffler but should be 90 degrees to the mount).
View attachment 20041

Looks nice! Did the AN kit fit well, or did it require much fettling?

Chris · Nov 27, 2020

I fitted a set of plain unchromed pipes from Armours over 20 years ago & had to " their advice" use a ballpein hammer to dress the front weld to get the exhaust rose on. In 2004 I brought an incredibly cheap set of chrome pipes new of a dealer at Stafford for the Seeley. I ran these on a road bike for a short while. They lined up perfect. Something amiss with the brackets maybe?

ILLF8ED · Nov 27, 2020

Fast Eddie said:
Looks nice! Did the AN kit fit well, or did it require much fettling?

The AN parts fit with no issue. My ISOs are new. The pipes are original to the bike, so no strange after market bend.

ILLF8ED · Nov 27, 2020

seattle##gs said:
I am trying to fit mufflers on an S model, both pipes on the left side. The pipes and mufflers are new. The mufflers have only one threaded boss welded on for the lord fitting...only one. And that one tilts toward the motor by perhaps 10 degrees (guesstimate). The big mounting bracket that bolts to the frame shock absorber bracket requires a straight in fitting. What gives? Are these muffs really for the SS model? And that one only? To make these work together would require either putting a severe bend on the lord fitting (and I would suspect it would fail quickly) or to cut and weld the existing main bracket. I am missing some information.

You might be able to use these mufflers. Put the rubber mounts through the long plate and screw into the muffler. You should have enough bend in the rubber to get the other side stud into the hockey stick bracket. Not really ideal as the rubber mount will be that much more stressed.

Knucles · Nov 27, 2020

Just received my S model exhaust system from Andover norton .
I bought their complete system in one package.
looks really nice .
here are a few pictures of the where the rubbers mount to .
looks like they are all welded 90 to the surface of the mufflers .

ILLF8ED · Nov 28, 2020

Knucles said:
Just received my S model exhaust system from Andover norton .
I bought their complete system in one package.
looks really nice .
here are a few pictures of the where the rubbers mount to .
looks like they are all welded 90 to the surface of the mufflers .

I’m curious to see if the pipes have a bend that lines up for the mufflers and clear the frame down tubes. I had original pipes for mine and the AN mufflers line up perfectly.

Knucles · Nov 28, 2020

It will be awhile till I get to the install of these.
the project should be herein the next week .
then the work starts .
hope to complete it over this winter.

seattle##gs · Nov 29, 2020

These are Campbell mufflers. No explanation of the angled boss. Switching to a new pair of AN mufflers would be the cure but I must work with what I've been given. Once again, does anyone have a used hockey stick bracket you aren't going to use? cutting and welding would solve the problem.

ILLF8ED · Nov 29, 2020

Knucles said:
It will be awhile till I get to the install of these.
the project should be herein the next week .
then the work starts .
hope to complete it over this winter.

It took me about a year from start to finish on my ‘69.

ILLF8ED · Nov 29, 2020

seattle##gs said:
I will use the term "bobbin mount"
The bobbin mount is tilted forward of the cone surface. To use these muffs and have them line up with the bracket would mean that the pipes would have a bend at the end and the muffs would then swing way out away from the bike.
Again it looks like a factory job..it was made like this on purpose. Both muffs are identical.
Does someone have a spare bracket that I could cut and weld? The one I am working with is brand new and chromed so I don't want to cut it up.
If I can't find the answer to my question I know how to solve the problem. Right now it requires quite a bit of force to bend the lord fitting or bobbin through the bracket.

Is it possible to cut the “bobbin” off the mufflers and reweld them correctly? I had a welder repair a broken muffler in the past and the weld was barely noticeable.

S & SS mufflers

seattle##gs

robs ss

seattle##gs

trident sam

dynodave

seattle##gs

dynodave

ILLF8ED

HRD

RoadScholar

Fast Eddie

Chris

ILLF8ED

ILLF8ED

Knucles

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