BMW K bikes (Bricks)

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1Back to top Go down    16 spline drive VS 20 spline drive? on Tue Sep 02, 2014 5:36 pm

stilbo

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Help! Bought a 32/11 drive box. Guy says it's from an '85 K100. It has 20 splines and mine has 16. Trans is a 16 spline. Shoulda researched this. Mid year change? Any alternatives? Universal joint and yoke look to be non-removable. Do I own a $150 20 spline boat anchor? 


Can I just get a good 20 spline drive shaft and count on it having 16 splines on the transmission end?



Last edited by stilbo on Tue Sep 02, 2014 5:45 pm; edited 1 time in total (Reason for editing : Update)

    

kioolt

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After checking with realoem.com I saw that the drive shaft changed after 2/1986. A further showed that the rear drive also changed after 2/1986. The transmission output shaft appears to be the same all the way through the K1100's. So it looks to me like you could get a before 2/1986 drive shaft and it should work.


__________________________________________________
2004 R1150RT 186,800 miles
1991 K100LT 128,700 miles
1982 R100RT 106,900 miles
Total422,400 BMW miles

AMA,BMWRA,BMWMOA


The cheapest thing on a BMW is the nut that connects the handlebars to the seat.
    

stilbo

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Wow! That's great! Thank you!
But did you mean to say that a post 2/86 shaft will work with my 20 spline box and '85 transmission?

    

kioolt

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Yes, I believe you are right about a post 2/1986 drive shaft. If you would like to double check my work, take a look at realoem.com. The K100's are listed in the archive section. Once you find a part number you can put it in "PART NR APPLICATION SEARCH" tofind out what other bikes it will fit.


__________________________________________________
2004 R1150RT 186,800 miles
1991 K100LT 128,700 miles
1982 R100RT 106,900 miles
Total422,400 BMW miles

AMA,BMWRA,BMWMOA


The cheapest thing on a BMW is the nut that connects the handlebars to the seat.
    

kioolt

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On second thought you would need a pre 2/1986 drive shaft since you have a pre 2/1986 rear drive.


I just gave it another look. I'm getting confused. The supplemental information for pre 2/1986 is z-16. I'm assuming that means 16 splines. The supplemental for post 2/1986 says z - 20.


__________________________________________________
2004 R1150RT 186,800 miles
1991 K100LT 128,700 miles
1982 R100RT 106,900 miles
Total422,400 BMW miles

AMA,BMWRA,BMWMOA


The cheapest thing on a BMW is the nut that connects the handlebars to the seat.
    

RicK G

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All the transmissions had a 16 spline output shaft


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"Every normal man must be tempted, at times, to spit upon his hands, hoist the black flag, and begin slitting throats." from Mencken's 1919 Prejudices

Bikes 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

stilbo

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Thank you both for your help!
I REALLY appreciate it!
I'm starting my search for a drive shaft now....

    

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