Throttle Body Sync - Jon Diaz - BMW R850 Maintenance Manual

If you still feel you just don't have it right you can always have you dealer use
the BMW Synchro on it.

Throttle Body Sync - Jon Diaz

How To Synch Those R1100 Throttle Bodies!
As an R1100 pilot, you've likely felt it: that little hum in the turn signal switch or
the vibrating mirror you can't see out of or worst case, a bike that surges so badly
at part throttle you can't ride smoothly. It's all part of those first days of R1100
ownership, and very easy to deal with.
When you twist the R1100 throttle, the cable actuates a cam on the left throttle
body, which in turn actuates a cable that crosses over to the right throttle body.
The cross-over cable tends to stretch during those first few months of use, and
this is why the cylinders fall 'out of sync' with one another at part-throttle settings
and give you fuzzy mirrors.
I purchased a mercury manometer (Carb Stix) from my local dealer to use for
this procedure. It consists of rigid plastic tubes sitting in a reservoir of mercury at
one end, with flexible hosing attached to the other end to plug onto the taps at
the throttle bodies. You will also need a 10mm box-end wrench, a flat-blade
screwdriver, and needlenose pliers.
Temperature of the motorcycle engine is critical to the success of this operation.
I like to run my bike for at least 15 minutes before returning to the garage to
perform the operation. Too hot an engine is bad as well, so avoid excessive
idling or traffic during your warm-up period. If it is really hot outside, use a room
fan in front of each cylinder to provide a little cooling breeze and temperature
stability.
After the warm-up ride, place the bike on the centerstand. Remove the black
plastic injector covers if your bike has them, remove the vapor recovery tubes
from the bottom side of each injector body, and insert the hoses from the Carb
Stix onto the exposed taps. Hang the Carb Stix from the ceiling with a bungee
cord or something similar so you can see the mercury levels easily from the right
side of the bike.
Then loosen the locknut on the cable adjuster on top of the right-side
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