pawl spring broke

[nsight]

I removed the transmission from my 1974 R90S to find out that the pawl spring is broke and this is why I had to drive home in 2nd gear. Where can I purchase a new spring and do they make an upgrade to this transmission. This spring that broke is way to small for what it does. I hate to put it back together like this again. This bike only has 21,000 miles on it.
Thanks Mark

[SteveD]

Bugger.
Far too common unfortunately. It's happened 3 times to me over the years. I knew a guy that had the trans from hell, doing 5 springs, all covered under warranty. That was 1981.
The springs are cheap, so any dealer should have them. I believe the design was improved.
Welcome btw.

[nsight]

Do they sell an improved version or larger spring? I read where they improved the design but I can't find anywhere if the new design was for the 1974 or where to get it

[SteveD]

I think what they sell these days is only the new and improved springs.
#4, #7, are consistent pn's thru the range even to the late 1970's R100RS.
#17 was changed in mid 1975...different pn and I can't tell you why or what else changed. If you spend some time looking thru the fiche you might get more info. Any dealer should be able to get them pronto.

http://www.maxbmwmotorcycles.com/fiche/ ... d=05012012



Further info, but mostly later...http://www.largiader.com/tech/airtrans/

Open this and head down the page a bit over half way for more info....http://bmwmotorcycletech.info/transmission.htm