By joining you will help ensure that we can continue to provide this service
JOIN HERE!
R50 exhaust nut replacement
R50 exhaust nut replacement
- therealkennyboy
- Posts: 93
- Joined: Sat Apr 02, 2022 5:44 pm
- Location: Scottsdale, Arizona
- Has thanked: 1 time
- Been thanked: 1 time
Re: R50 exhaust nut replacement
Scottsdale, AZ, USA
1960 R60 (currently), 1974 R75/6 (past), 1981 R100CS (currently), 1984 R100RS (past), 1989 K100RS (past)
- monson2765
- Posts: 7
- Joined: Fri Oct 27, 2006 3:00 am
Re: R50 exhaust nut replacement
- jwonder
- Posts: 784
- Joined: Wed Nov 23, 2016 7:50 pm
- Location: Long Island, New York
- Has thanked: 3 times
- Been thanked: 8 times
- Contact:
Re: R50 exhaust nut replacement
Here is what I did:
1) I ground the flange down just enough to remove the original finned nuts. This left about 1/2 the flange height that was there originally.
2) I then got a thrust ring from an R 69 S https://bmwclassicmotorcycles.com/index ... 8114090254
3) I machined the outside down to where it was within about .020" of fitting into the nut (I forget the exact measurement but it was close to that)
4) I then made an angle cut in the thrust ring to allow me to squeeze the ring and slide it in the nut.
5) I wanted it to fit quite tight on the pipe when compressed, in order to get a good grip on the leftover flange, so I needed to play with the outside diameter and the angle cut width to get the best fit.
6) Once this was done and I verified it would work, I had the exhaust chromed.
7) The copper gasket crushes to fill any small gaps that might be there, but it is quite a good seal.
One other thing I was able to do with this setup is machine a spacer to go between the nut and the ring in order to space the nut a bit away from the head. It really allowed me to tune both sides to fit exactly and be exactly the same distance from the head side to side.
I have original pipes, original nuts and I am able to take them off if I need to do that!
Vice President, Vintage BMW Motorcycle Owners
2022 BMW Friend Of the Marque
Long Island, New York