BMW K bikes (Bricks)

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1Back to top Go down    Interesting drive shaft video on Mon Jul 17, 2017 1:54 pm

duck

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Somebody posted this on the K11 OG forum. Interesting if you're a gearhead and at the end it demonstrates the importance of proper U-joint phasing on the 4V paralever Ks.

https://www.youtube.com/watch?v=gmV4qwLfOMY


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Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S
14 Yamaha WR250R
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2Back to top Go down    Re: Interesting drive shaft video on Mon Jul 17, 2017 8:35 pm

RicK G

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Also shows how BMW made a monumental mistake in having only one uni joint on the monolever shaft and why it hammers the splines because the shaft is changing rotational speed while the pinion shaft is staying at a constant speed.
The only saving grace is the free play in the gearbox at the engagement dogs otherwise the shaft would tear itself to bits within a few thousand miles if that long..


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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
    

3Back to top Go down    Re: Interesting drive shaft video on Mon Jul 17, 2017 8:50 pm

duck

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JMHO but I think what causes the majority of the spline wear is the rear splines sliding against each other under load when you accelerate. That's when there's the most power being transmitted and the mono splines slide against each other when the monolever FD gets "jacked."

Pretty sure that''s why the splines at both ends of the para drive shaft are held in place by clips - so they can't slide more than a very small amount.


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

4Back to top Go down    Re: Interesting drive shaft video on Mon Jul 17, 2017 9:07 pm

RicK G

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This is what happens when the hammering takes place and you are right that it would happen under acceleration


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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
    

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