R26 exhaust nut

[BSA Bob]

When my R26 motor is repaired I'd like to use a finned exhaust nut to secure the pipe. I don't think these are standard for the R26. Can some kind soul tell me what I need. Perhaps R50S?

[BSA Bob]

[Heiko]

Hi Bob,

think that you can get one by our standard dealers.

[strichzwojan]

Look here:

https://www.meyer-bikes.de/index.php?page=details&art=18114090110b

Seems to be the same type from R24 up to R27.

Jan

[Kurt in S.A.]

It does say at the bottom of the screen that it is an "alternative" to the original nut.  The official part number doesn't have the "b" at the end of it.

Kurt

[Heiko]

b for alternative 

[strichzwojan]

There has never been a finned nut in the single cylinder programm of BMW, so it is easy to accept! BTW, the finned version is much better: no more dirt, salt water corrosion, and the copper gasket is held better in place and sits tighter, and most important better cooling at the exhaust channel.

[rolf.soler]

Part No is
18 11 4 000 002
Sternmutter für Auspuff R24 - R27, R50S
available also from Huggett, Rabenbauer,
Stemler No. 00 00 0 000 647
and yes, its not original in single cylinders, but in boxers. This one is official part for R50S, but fits the single cylinders And its better. But I'd order the tool with it ("Sternmutterschlüssel"). costs more than the nut, is big and heavy but best for tightening and loosening this nut

[BSA Bob]

Thanks for all this information people. I already have a large & lethal looking tool to fit the nuts on a 69S, I hope this fits the nut I need.

[strichzwojan]

I use the same tool for the nuts of my 25/2, 75/5 and 100GS.

Jan

[rolf.soler]

I guess it fits all the star nuts, try when you get it.
When I bought it, Mark Huggett told me that it is useful also as an anti-burglar tool when camping

[BSA Bob]

It's got a sort of Dark Ages look to it. One can imagine Knights & Men at Arms bashing each other with them.

[Jollyjester]

Finned Exhaust Nut

Back in the 1960's when there was no such thing as Internet, or access to BMW Dealers in Europe, I wished to have a 'Finned Exhaust Nut on the R25s. "S" because it has an R50s Piston. But you have to open out the  con rod small end to take the 20 mm piston pin.
Most Motorcycle Dealers sold an alloy finned accessory, that went over the factory Exhaust Nut, and clamped with a suitable Nut / Bolt. I used that, and it is still in situ, because, that was how I did it in 1965, and I wish to to retain the original idea.

Another 'mod' was fitting a Rev counter 2:1 anticlockwise. Picked up the drive from the end of the camshaft, drilling and adding  a screw thread to fit the cable drive.

It would rev to 7200 down hill !! but would not stop!. So a Norton Front wheel / brake went in. Then it 'stood on it's head'

The Rev counter is gone, but the drive still in place. By the way, the R50s Piston lasted until 2020, so i suppose with 55 years use it must have been OK. Eventually in 2020, a circlip that retains the piston pin ''snapped' which 'kaput the piston, . The Piston pin ( we call it a Gudgeon  Pin in Britain, USA a 'wrist pin' ) moved over and made a slight score on the cylinder barrel.

That was lightly 'honed out' a  new R50s Piston (Mahle) about £150.001st over size. and I am back on the road. all being well i will be aged 130 before i have to do it again

[cwf]

Will we be able to afford petrol by then? Or even find it?

I was reading a book 'Two-wheeled Blitzkrieg' by Paul Garson, photos of bikes used by Axis forces in WW2, and there was a photo of what may have been the first OLEX (BP) refuelling station in Germany in 1922, with a pump and hose to reach the tank. Before then, fuel was sold in bottles at pharmacies, bicycle shops, hotels and restaurants. The bottles look to be one litre, so, either people didn't travel very far or there was an outlet in every village.

When we were (very) slowly moving from gallons to litres but retaining miles (in UK), I was riding an R 80RT. I looked at the metric way of working out fuel consumption and didn't like it but miles/litre worked very well - 10 miles per litre for me, so one bottle would get me ten miles.

Charlie.

[Eppo]

Hey Charlie,
when I was the first time to the US I had some big trouble to get used to the counting of miles per gallon.
But as I was travelling by motorcycle it was a really useful way to know how far I could travel with a full tank.
So it is a much faster and easier way to calculate the distances for a half or quarter of the full capacity.
Much easier than what we do in Germany.
One value is the consumption (litre/100km) and the other value the reach (mpg) so that it 

[rolf.soler]

Most Motorcycle Dealers sold an alloy finned accessory, that went over the factory Exhaust Nut, and clamped with a suitable Nut / Bolt. I used that, and it is still in situ, because, that was how I did it in 1965, and I wish to to retain the original idea.

That type of nut, or rather a finned sleeve to clamp over the original nut,  is also still available with some dealers (Stemler e.g.)

[cwf]

Hello Eppo,

'when I was the first time to the US I had some big trouble to get used to the counting of miles per gallon.'

Yes, my wife and I flew to New York in 1980 and bought a cheap gas-guzzler, a Mercury Montego Estate for $150 and spent 10 weeks driving across the US (north). The first problem was a US gallon is 16 fluid ounces, an English gallon is 20 fl.oz. (So the US gallon is 20% less).

It was during a fuel crisis and there was a 55 mph speed limit, which didn't bother us much, we stayed on small roads but we were surprised that everyone was driving faster than us. Eventually a back tyre went bang and, when we went to a tyre shop, we realised we had bought a car with retread snow tyres (which were smaller outside diameter), so we were doing maybe 50 mph at an indicated 55.

Now I ride a 50/2, the consumption is more like 15 miles/litre - just as well, seeing the cost at the moment.

Charlie.

[cwf]

Sorry, too long since school. 20 fluid ounces (or 16 US) makes a pint and there are 8 pints in a gallon. And we will fight to defend this until.....

[Eppo]

Sorry, too long since school. 20 fluid ounces (or 16 US) makes a pint and there are 8 pints in a gallon. And we will fight to defend this until.....

Hey Charlie,
come to the decimal side of counting, we have cookies