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 178,100 miles
1991 K100LT 128,700 miles
1982 R100RT 106,900 miles
Total413,700 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 178,100 miles
1991 K100LT 128,700 miles
1982 R100RT 106,900 miles
Total413,700 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 178,100 miles
1991 K100LT 128,700 miles
1982 R100RT 106,900 miles
Total413,700 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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If everything seems under control then you aint goin fast enough:- Mario Andretti
Bikes 1986 K100RT, 1993 K1100 LT, 1994 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 & 1976 SR 500 Yamaha 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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