© 2018 Drake Smith - Please do not
use or reproduce this elsewhere. Feel free to link to it
apply to K75s.)
K100s, K1s and K1100s all have rubber
bushings where the handlebars mount to the upper fork tree. The
purpose of this is to minimize the amount of engine vibration
transferred to the rider's hands. However, a side effect of this
is that it can make the steering on these bikes somewhat mushy.
the K75 engine runs so smoothly the handlebars on those
bikes are solidly mounted to the upper fork tree without any
If you find the steering on your
four cylinder K to be too mushy for your liking then you can
simply add some washers to firm up the steering.
The first section of this covers
how to do this to a 2 valve K100. The section following that
describes how to do it to a 4 valve K bike. (K100RS4V, K1 or
The clamps for K100 handlebars
are mounted in large rubber bushings in the upper fork tree.
This means they can move around some and be mushy. A
simple solution is to harden up these mounts by adding 1/8"
think bronze thrust washers under the top and bottom washers
of the handlebars mounts. (I used thrust washers with a 1"
outside diameter and a 5/8" inner diameter.)
K1 or K1100 Handlebars
The handlebars of a 4 valve K bike
can be "de-mushed" by simply adding a thrust washer under the #4
rubber bushing on each side. See the red circle in the parts
Since you're just adding a washer
underneath each bushing this is a pretty simple and quick
modification that can be done one side at a time without any
The #6 nut is usually covered
with a plastic cap that needs to be pried off.
Then unscrew and remove the
#6 nut and the #5 washer above it.
Install a thrust washer above
the #5 washer and reassemble.
The best washer to use for this
is a 1/8" thick thrust washer with a 1" outside diameter and a 5/8" inner diameter.
Although it sounds simple enough,
the tricky part is getting the thrust washer centered so
that it rests inside of the hole in the fork tree and also
so that the bottom of the #2 handlebar clamp can pass through it.
It needs to be well-centered with respect to both of those
parts in order to apply good compression to the #4 rubber
© 2018 Drake Smith - Please do
not use or reproduce this elsewhere. Feel free to link
to it though.