54
this was a good starting point. What is the standard opening fixed by the blue
paint? Is it air flow, gap between the butterfly and bore or, arghhh(!) "x" number
of turns from full closed? I wondered, if .370-.400 volts "should" be what
equates to a proper opening for idle, perhaps screwing out the throttle stop on
the left throttle body should yield .000 volts at the TPS. Well, guess what? I
have done this very procedure on my RS with great results. I repeated this on a
friend's GS with equally good results. Then, just recently, I checked another
strong running RS and found that if the TPS reads about ..000 volts at zero
throttle opening it is SET JUST RIGHT! So "zero = zero". If set this way, throttle
response is very good, surging is nil, and top speed is as good as it gets (wire
#3 is under 4.00 volts WOT, at least on RSs).
Procedure
Prerequisite: Be skilled with a digital voltmeter (DVM) and have good
mechanical skills. You will need a quality DVM and a mercury manometer.
Valves should be correctly adjusted (for left to right balance) and all required
service performed as prescribed!
AND, IF YOU HAVE NO COMPLAINTS WITH YOUR BIKE, LEAVE IT ALONE!
You want to go for it? Here goes:
1. Loosen the throttle free play at the at the outside / forward adjuster on the left
throttle body and make sure you also have free play at the crossover synch
cable by adjusting the cable on the right throttle body.
Note: In the following steps be sure that you know the difference between the
THROTTLE BODY STOP SCREW and the BRASS BYPASS SCREW!
2. Loosen the lock nut and unscrew the left throttle body stop screw (under and
inside of the throttle body) counterclockwise (CCW) about three turns until you
can see a gap between the end of the screw and the flange it pushes on to open
the throttle. (Note: early R’s had no locknut, just an interference fit. The locknut
is 8mm and the stop screw is 7mm - however this may vary from model to model.
A thin 7mm ignition wrench works well on the stop screw as does a stubby
screwdriver. Working room is limited, so use patience!). Once you have made
this adjustment you are assured the left throttle is FULLY closed. Be sure!
3. Attach the DVM to ground and the TPS white-red wire #1. Probing with a
paper clip is one method of reaching the contacts. Turn on the ignition, be sure
the engine cutoff switch is in the on or run position, and retract the sidestand.
Don't start the engine.
4. Loosen the two screws securing the TPS. Adjust the TPS by slowly turning it
within its slots until the observed voltage decreases to about .006 volts. It will
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