BMW R850 Maintenance Manual page 68

Attach one of the carb stix's flexible plastic tubes to each brass nipple. Make certain that
the carb stix's plastic tubing does not touch hot exhaust parts; the tubing will melt. There
is no need to plug the black vapor recovery tubes.
Step 9. Set right throttle plate stop screw using carb stix.
At this time, locate the right throttle plate screw (mirror image position of the one on the
left side). The screw will have a lock nut similar to the one on the left side. If it is difficult
to manipulate the lock nut and screw, you have located the correct hardware.
With the bike warm and the fan on, look at the mercury columns. If they are not at an
equal level, loosen the lock nut on the right side throttle plate and adjust the screw in or
out until the mercury columns are equal. If the bike will not idle, then turn both large
brass bypass screws out another 1/4 turn.
Step 10. Reduce TPS in increments of 0.020 if idle exceeds 1100-1200 rpm
After adjusting the right side throttle plate screw to get equal mercury columns, look at
the rpm. Ideally, rpm is now 1100 to 1200. Some bikes will have an abnormally high
idle; as high as 1800 rpm or more. This is most prevalent in GS and R models. To
correct the high idle, return to Step 6 and place one lead of the digital volt meter (DVM)
back on the red and white wire of the TPS and ground the other lead. DO NOT move
the Bosch black TPS. Reset the left throttle plate screw (the left rear screw with lock nut
that was difficult to adjust) and reduce the TPS voltage by 0.020 volts (from .370 to .350)
by turning the throttle plate screw. Continue with the rest of the Steps in order after Step
6. If the idle is still too high, continue to reduce the TPS value by increments of 0.020
until the desired idle is reached.
Step 11. Reset throttle cable (left side) to .5 mm free play
Reset the left side throttle cable for about .5 mm of free play. Check this by twisting and
releasing the throttle several times and then rechecking the free play.
Step 12. Perform the "Throttle Body Synch for Dummies", which is part of the R1100
Maintenance Guide and also has been submitted for inclusion in the IBMWR Web site.
Copyright(c) 1997, Stephen Karlan (Dali Meeow) in Miami, FL. <dali@netrox.net>
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