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My instructions are to set the left stopscrew to .370 volts, which approximates
the lower value of .370 - .400 that others such as Jon Diaz have reported as the
normal TPS range. On some machines this setting will result in a higher than
normal idle speed, say around 1400 RPM, that cannot be reduced by going CW
with the bypass screws.
FIX: Reduce the TPS voltage with the left stop screw in increments of
.020 volts (.370, .350, .330, etc) and resynch with the right stop screw until an
idle speed of 1000 RPM is achieved with the bypasses closed. Then open the
bypasses and re-synch with them to achieve a final idle speed of 1100-1200
RPM.
B. ENGINE WON'T RUN AFTER "ZERO=ZERO" WITH BYPASSES SEATED.
I ran across this problem while working on an R1100R.This may occur on other
GS/R types since the throttle bodies are different than RS/RT versions. I pulled
my hair for awhile until I opened the bypasses equally 1/2 turn CCW and the
motor idled (albeit very slowly). The INITIAL opening (BMW spec) of the
bypasses on RS/RT machines is 1 1/2 turns, and on the GS/Rs is 2 1/4 turns
making the "control" of the bypasses on the GS/Rs much more pronounced.
FIX: After setting the TPS to zero=zero it is time to do the super-accurate
mechanical synch with the right stop screw. On some machines, notably GSs
and Rs, you may have to open the bypasses some to get the machine to idle so
as to perform the mechanical synch. If necessary (and don't do this if not
required), EQUALLY open each bypass 1/4, 1/2, or whatever turns or fractions
thereof is required for the motor to idle. The less open the better, because we
want to do this mechanically and minimize bypass irregularities.
So in summary, what have we done? We set the TPS for zero volts at zero
throttle plate opening. Then we opened the left plate to .370 volts followed by
an accurate synch. Pretty simple, and it WORKS! You will notice very good
cold starting, good throttle response, little if any surging, and good top end.
Let me know how this works for you. This same procedure will apply to R1100
RS/GS/RT/R and R850R machines.
REVISED "ZERO=ZERO" FOR '97 OILHEADS
'97 Oilheads have the new throttle cable distribution box under the battery area
on top of the engine. Here is a revised "zero=zero" TPS procedure for these
newer bikes, though it's hardly changed.
The difference between the old system and new is the fact that the throttle cable
from the twistgrip goes to a distribution box located underneath the battery area.
The throttle cable attaches internally to a bellcrank wheel. Then two cables
leave from the wheel to each throttle body, so there is no crossover synch cable
(16 Seiten)
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