Start the engine and let it idle to measure the carburetor
If the intake vacuum difference between the two cylinders
exceeds the limit, adjust the synchronization.
Engine Vacuum Synchronization
Less than 2.7 kPa (2 cmHg) difference between both
Turn the adjusting screw [A] to synchronize the carbure-
If the carburetor synchronization cannot be obtained by
using the adjusting screw, check for dirt or blockage, and
then check the pilot screw settings.
Special Tool - Pilot Screw Adjuster, C: 57001-1292
Do not turn the pilot screws carelessly during carburetor
synchronization. You may cause poor running at low
Check idle speed and adjust if necessary.
Service Fuel Level Inspection
Gasoline is extremely flammable and can be ex-
plosive under certain conditions. Turn the ignition
switch OFF. Do not smoke. Make sure the area is
well-ventilated and free from any source of flame
or sparks; this includes any appliance with a pilot
Situate the motorcycle so that it is perpendicular to the
Connect a suitable rubber hose (5 mm inside diameter
and about 300 mm long) to the fitting at the bottom of
each carburetor float bowl.
Connect fuel level gauge [A] to the rubber hose.
Special Tool - Fuel Level Gauge: 57001-1017
Hold the gauge vertically against the side of the carburetor
body so that the "middle" line [B] is several millimeters
higher than the bottom edge [D] of the carburetor body.
Turn the fuel tap to the PRI position to feed fuel to the
carburetor, then turn out the carburetor drain plug [C] a
Wait until the fuel level [E] in the gauge settles.
FUEL SYSTEM 2-9