A common complaint about two
valve Ks is that the throttle return is slow, sluggish or
sticky. (Pick your favorite adjective.) This is often very
easy to improve by simply using a thinner lubricant than the
gooey grease used by BMW.
Remove right combination switch: There's a small
M4x12 Phillips screw that holds the combination switch to
the throttle perch. If this screw has not been touched since
it was installed at the factory then it may be difficult to
loosen so use a good screwdriver with lots of pressure to
initially break the threads free. If you don't then you risk
stripping the head of that screw.
Remove throttle cam cover: Remove the large
Phillips screw to the right of the front brake master
cylinder. Use a large tipped Phillips screwdriver or PH3
The cover may be a little sticky
to lift off but it does lift straight up.
If you have heated grips then be very careful not to pull
the throttle twistgrip out to the right or spin it around
when the cam cover is removed. The heated grip wiring is
attached to the outer end of the twistgrip. The wiring is
delicate and very easy
3 - Add
new lubricant: You can be anal retentive and take
the throttle perch apart to clean out all of the old grease
first but it's easiest just to spray lots of new lubricant
into the throttle cam area and save yourself a lot of extra
My preferred lubricant for this
task is aerosol spray silicone. You should be able to find
it at your local hardware or auto parts store.
If your bike does not have
heated grips then remove the twistgrip and lubricate the
handlebar surface as well.
Reassembly: Your throttle gears may not look
exactly like this picture from the BMW manual but there are
indicator lines on both the throttle cam and twist grip that
should be aligned when you push the twistgrip in and push
down on the cam before reinstalling the throttle cam cover.
There is no need to he-man the cam cover screw. Just get it
nice and snug.
Before reinstalling the
combination switch twist the throttle and let it go a few
times. The return should be noticeably better than before.
If there is little to no improvement then the grip rubber
may be rubbing against the side of the throttle perch or, if
you have bar ends, rubbing against the bar end weight.
© 2021 Drake Smith - Please do
not use or reproduce this elsewhere. Feel free to link
to it though.