1 K100 Final Drive Modification .. A 2.54 Ratio Bevel Drive Tue Jan 31, 2023 7:49 pm
Kafflut
Silver member
I'm posting this on behalf of my friend Phil Moser:
This will be of interest to all K100 owners.
I’ve successfully built a 2,54 ratio ( 33 : 13 ) bevel drive into a K housing using the gears from an R1200C. Standard K100 is 2,82 ratio ( 31 : 11 ), and so it reduces revs throughout all gears by 11%.
It’s made mine VERY long legged, slightly under 4k revs at 120km/h. Another advantage is reduced vibrations. The motor, being very torquey, pulls fine through this ratio. The speedo, taking its input from the rear wheel speed ( not drive shaft speed as in airheads ) stays correct, of course, and the “spacing” of the gears is not affected as it is in “shorter 1st / longer 5th” as is done by a number of airhead GS riders.
But be warned ! Neither a cheap nor an easy job !
For a more comprehensive article with pictures, see https://pdfhost.io/edit?doc=1ca72a28-fe6b-4564-ada4-7c44fe9d73ea
The link takes you to PDF HOST ... you will see a thumbnail of the article ... click on VIEW DOCUMENT
This will be of interest to all K100 owners.
I’ve successfully built a 2,54 ratio ( 33 : 13 ) bevel drive into a K housing using the gears from an R1200C. Standard K100 is 2,82 ratio ( 31 : 11 ), and so it reduces revs throughout all gears by 11%.
It’s made mine VERY long legged, slightly under 4k revs at 120km/h. Another advantage is reduced vibrations. The motor, being very torquey, pulls fine through this ratio. The speedo, taking its input from the rear wheel speed ( not drive shaft speed as in airheads ) stays correct, of course, and the “spacing” of the gears is not affected as it is in “shorter 1st / longer 5th” as is done by a number of airhead GS riders.
But be warned ! Neither a cheap nor an easy job !
For a more comprehensive article with pictures, see https://pdfhost.io/edit?doc=1ca72a28-fe6b-4564-ada4-7c44fe9d73ea
The link takes you to PDF HOST ... you will see a thumbnail of the article ... click on VIEW DOCUMENT