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Throttle Body Synch for Dummies – Stephen Karlan (Dali Meeow)
An out-of-synch condition develops (R850 and R1100) because the throttle body cables
stretch or because they lose their adjustment. The result is vibration, sometimes unreal
vibration.
The following procedure, which I call the Gorman/Diaz Balance, was developed by Bob
Gorman and Jon Diaz from Chicago. It is a fast and simple procedure that can yield dramatic
riding improvement.
The 1994-96 models have a crossover synch cable; the 1997 model has left and right throttle
cables attached in an upside down "Y" pattern. Use these instructions for the 1994-96 models.
If you have a 1997 model, look for the ['97 - ] and follow the instruction inside the brackets
and disregard the instruction given immediately prior to the ['97 - ] brackets.
Overview:
The throttle bodies will be synched at two rpm levels.
The low rpm synch will be done first. With the bike at idle (1,000 to 1,200 rpm), the large brass
bypass screws will be adjusted. (LBBS in the Glossary at the end of this article will help you
find this part.)
The high rpm synch will be done last. With the bike at 2,500 to 4,000 rpm, the right side
crossover synch cable will be adjusted. (RSCSC in the Glossary at the end of this article will
help you find this part.) ['97 - right side throttle cable will be adjusted.]
Tools needed:
mercury manometer (carb stix) and a way to secure it (several places to obtain the carb stix
are given at the end of this article)
small pliers or needle nose pliers
10 mm wrench
flat screwdriver
pencil and paper.
Setting Up:
Remove the right side black plastic fuel injection plug cover for access to the right side
crossover synch cable ['97- remove cover for access to right throttle cable]. If you have a lower
fairing, remove it to allow air to reach the cylinders and to prevent cooking the fairing. With the
bike on the center stand, retract the side stand, put the transmission in neutral, turn on the bike
and warm up the engine. Jon Diaz
suggests a more enjoyable way to warm up the engine -- take a ride.
Position a fan near the front tire with its output directed at the cylinders equally to avoid
overheating, or use two fans, one directed to each cylinder. If your bike has a Rider
Information Display (RID), allow the oil to heat up to 5 bars, otherwise idle the bike for five
minutes.
Secure the mercury manometers (carb stix) on the right side of the bike, where most of the
work will take place. Use any method that secures the carb stix (and the hazardous mercury)
vertically while the bike is running, such as hanging the carb stix from the ceiling.
(16 Seiten)
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