Originally Posted by isdt BMW
There are 2 slingers, crank must be out of the motor case to clean them. In my 40+ years of working on them, I have never seen clean slingers. do them once and with modern oils, you can enjoy years of trouble free riding. The Clyber manual is OK but the Bjetman rebuild bkkk is better and has mich more info. the pre /2 bikes are fine, it doesn't matter what year you get. Did you get the bike?
Im curious about this book from Bjetman, but the Great Google cant find it. Could you please provide us a link. Thanks.