Here is a photo essay of sorts detailing the disassembly of a 1973 BMW Final drive. The same applies to all 1970’s era BMW’s (R90 R100 R75 R80 /5 /6 /7 S etc). The seals were shot inside causing leaks. The splines are decent so no need to weld on a new set of splines. I plan to have the drive blasted and powder coated to match the rest of the bike for an upcoming build.
The image descriptions have notes on the disassembly.
This is one of those things I try to do to every BMW motorcycle I rebuild.
This area is cracked on nearly every frame I tear down. It is the rear foot brake area which also is the muffler / silencer hanger, and where the passenger foot pegs attach. This frame is a 1978 BMW R100s. If you are considering rear sets on your bike that attach to this section, then I HIGHLY RECOMMEND doing this procedure.
cracked tab near rear foot brake pivot hole on BMW airhead framecracked tab near rear foot brake pivot hole
cracked tab near rear foot brake pivot hole on BMW airhead frame
New piece of metal to weld onto the old cracked section to reinforce the area making it MUCH stronger and no longer prone to cracking.
Welded metal onto the rear foot brake section of a BMW R100S
Finished powder coated frame with the welded metal. This area is out of sight to most people unless they take the rear tire off.
Just an update… I have 3 bikes in the works but they have been taking longer then expected. I’m trying to customize many features vs buying the available parts out there.
And, I’ve been busy over at Oshmo.com helping to develop some Airhead aftermarket parts that look good, and function, for customizing these old BMW’s.
Recent additions are rear sets, and top clamps… more ideas to come!!
I was just having a conversation with a buddy 2 days ago about how BMW should ‘remake’ one of their old bikes.
Triumph did it with the Bonneville. Ducati has the Paul Smart bikes (which i love).
Well, here it is. The homage BMW R90S.
The original R90S is a true classic.
While the new bike looks amazing… i fear that it looks too much like a new bike and not enough like a classic.
Of course, i’d still love one in my garage….
First off, this is a great film because it discusses actual motorcycle safety that is relevant today.
Second, it is a great film containing great footage of a R90s cruising through Germany in the 70’s.
After watching it, i gave my R100s a good bath and was appreciative for being able to own such a bike.