BMW K bikes (Bricks)


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1Back to top Go down   Now the truth comes out Empty Now the truth comes out Thu Jul 11, 2013 9:40 am

Rick G

Rick G
admin
admin
After getting some questions as to where the info came from about the K100 and K75 gearboxes having different top gear ratios I did some investigating with the parts book/s
I first got the info on the motobrick site and I questioned it then and was shown copies of the original sales brochures that BMW printed for the North American market and most likely the rest of the world as well.
It stated the K100 as having a top gear ratio of 1.61 - 1 and the K75 was 1.67 - 1. This can not be correct as the part numbers for all the 8v engines K100 or K75 are as follows Drive gear on the input shaft is 23211 451 039 and has 18 teeth that is common all the way through to the end of production of the 5 speed getrag gearbox which was 3/1997.
The driven gear on the output shaft part number is 23211 451 075 and is a 30 tooth gear and is the same right through the production of gear boxes for the 8 valve engines.
However there is a difference in the gearboxes for the 16 valve engines K1 K100 RS 16V and all K1100, the driven gear is part number 23211 461 900 and it is a 29 tooth gear.
So actually the difference is between the 8v and 16v engines not the 3 and 4 cylinder engines.
The ratios are correct but the 8v engines have a 5th gear ratio of 1.67 - 1 and the 16v engines have a 5th gear ratio of 1.61 - 1.

This info has come from real OEM which we all seem to accept as a reliable source for this type of info.


__________________________________________________
"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 1999 K1100 LT with a Big Block 1200
    

2Back to top Go down   Now the truth comes out Empty Re: Now the truth comes out Thu Jul 11, 2013 9:55 am

klompy the grey brick

klompy the grey brick
VIP
VIP
I guess I would have to be stating the bleeding obvious but is it not written/stamped on the item?...or even comparison of RPM to miles/kilometres per hour.....just saying.
Although if the part numbers are the same....anyhow 75's are quicker and 100's are faster isn't that right?


__________________________________________________
KKlompy Now the truth comes out 2854237993
"Grace" 1984 K100RS Silver VIN 0019026 Mitt eine Staintune Zorst.
"Olivia" 1997 K1100LT Dark Grey VIN WB1052600W0237453.









Chassis number0019026
Vehicle code0503
SeriesK589
ModelK 100 RS 83 (0502 ( 0503 )
Body typeK 100 RS 83 (0502
Catalog modelECE
Production date1984 / 07
Engine0513)

Now the truth comes out Au-log10


    

3Back to top Go down   Now the truth comes out Empty Re: Now the truth comes out Thu Jul 11, 2013 4:56 pm

sidecar paul

sidecar paul
Life time member
Life time member
Hmm, the plot thickens, so why did BMW print this?

Now the truth comes out Sam_0620

Now the truth comes out Sam_0621

Yes, I know it doesn't matter a jot in practice but to be real K geeks we need to have the truth!

Paul.


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'84 K100RS (0014643) (owned since '85), 86 K100RS (0018891) with Martello sidecar (built as an outfit in '88),
'51 Vincent (since '67),'72 Montesa Cota (from new), '87 Honda RS125R NF4 (bought 2015) 
....No CARS never ever!
    

4Back to top Go down   Now the truth comes out Empty Re: Now the truth comes out Fri Jul 12, 2013 3:53 am

Rick G

Rick G
admin
admin
I don't think there really is a plot as such but some numpty that got a thick ear after the second boo boo that was made.
The brochures I saw copies of were fairly much the same as that one so were probably from the same time frame

Like you say no real difference except to the Klovers.


__________________________________________________
"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 1999 K1100 LT with a Big Block 1200
    

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