BMW K bikes (Bricks)

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1Back to top Go down   20 spline driveshaft Empty 20 spline driveshaft Thu Feb 03, 2022 10:42 pm

arbalest

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What models and years driveshafts will interchange with 20 spline K100? Looking through Fleabay it looks like K1100 an K1200 might fit. Also, it looks like R1100 might also fit. May need to lengthen the s.a. to suit. I am looking for something that will fit. Any info?

    

2Back to top Go down   20 spline driveshaft Empty Re: 20 spline driveshaft Thu Feb 03, 2022 11:36 pm

92KK 84WW Olaf

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20 spline refers to 2v Monolever shaft used in some 2v K100 and all 2v K75. Not 4v K100 and also not K1100/1200, they are Paralever. Also early K100 have16 splines.


__________________________________________________
1992 K100LT 0193214 Bertha Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 106,950 miles Deceased.
1983 K100RS 0011171 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 40,490 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 42,640 miles.

Past:
1968 Yamaha 80 YG1
1971 Yamaha 125 YAS-1
1968 Honda 125 SS
1970 Honda CD 175
1973 Honda CB500-4
Honda CX 500
    

3Back to top Go down   20 spline driveshaft Empty 20 spline Thu Feb 03, 2022 11:45 pm

arbalest

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92KK 84WW Olaf wrote:20 spline refers to 2v Monolever shaft used in some 2v K100 and all 2v K75. Not 4v K100 and also not K1100/1200, they are Paralever. Also early K100 have16 splines.
My mistake. I had an early 85 K100 and I understand that the spline was changed later, but I don't know what the cut off was. And to show my further ignorance, I don't know whether we are talking about splines on the transmission end or the fd end.

    

4Back to top Go down   20 spline driveshaft Empty Re: 20 spline driveshaft Fri Feb 04, 2022 7:15 am

Porto

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Hi mate, I don’t the answer. How ever can I ask if you are wanting to replace a worn out drive shaft or wanting to change the final drive ratio? 
I recently serviced my 85 K100rt, it was still in good shape and I always neglected it. 
Porto

https://gpleather.com
    

5Back to top Go down   20 spline driveshaft Empty Re: 20 spline driveshaft Fri Feb 04, 2022 8:52 am

92KK 84WW Olaf

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20 spline refers to the final drive end. The gear box end did not change. Be aware you can actually buy a new splined end for 20 splie shafts and have it welded on to the drive shaft at a machine shop.

At 1985 you may have a 16 spline shaft, you need to check this out more. If you do, they can be harder to find. I have 2 Ks on 16 spline final drives but also have 2 31/11 ratio spares for them.

You can find a 20 spline final drive and 20 spline shaft and just pop them straight in. Mostly the final drive ratios are 31/11 for RS and 32/11 for RT/LT. Its a small difference and I would go on condition/price rather than focus on the small difference in the ratio. A K75 one for rear disc brake will also fit BUT the ratio on those is usually 32/10 but thats a bit out for you at 10%. The ratio is stamped on the top of the final drive casing.


__________________________________________________
1992 K100LT 0193214 Bertha Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 106,950 miles Deceased.
1983 K100RS 0011171 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 40,490 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 42,640 miles.

Past:
1968 Yamaha 80 YG1
1971 Yamaha 125 YAS-1
1968 Honda 125 SS
1970 Honda CD 175
1973 Honda CB500-4
Honda CX 500
    

6Back to top Go down   20 spline driveshaft Empty 20 spline Fri Feb 04, 2022 9:19 pm

arbalest

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OK. I am confused. I thought the early mono lever K's had the 16 tooth spline, but I was perusing Fleabay and found an 89 driveshaft with a 16 tooth spline. So, which is correct. The final drive I have is a 20 tooth spline.

    

7Back to top Go down   20 spline driveshaft Empty Re: 20 spline driveshaft Fri Feb 04, 2022 10:44 pm

RicK G

RicK G
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IIRC it was part way through 1985 that the change to 20 spline shafts was made. If you have seen a 16 spline shaft from an 89 model then it has replaced a 20 spline along with the final drive from the earlier model. Remember all the K100s are at least 30 years old so most have had many parts replaced with used parts from wreckers. I doubt that there would be many if any that have all original parts.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 2004 K1200GT 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

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