FUEL SYSTEM / CARBURETION
4.9
PILOT SCREW
The pilot system supplies fuel during engine operation
with the throttle valve closed or slightly opened. The
fuel/air mixture is metered by pilot screw and
discharged into the main bore through the pilot outlet.
CAUTION:
The pilot screw is calibrated at the factory to meet EPA / CARB
regulations for air quality standards and is sealed with a brass
plug to prevent tampering. Removal of the tamper proof plug
is not permitted. For service purposes, cleaning of the pilot
circuit can be done only by a certified repair shop to ensure air
quality standards are not exceeded.
Pilot Screw location
Brass Plug Installed
Brass Plug Removed
CARBURETOR
DISASSEMBLY - MIKUNI
CV
Use the following disassembly, assembly, and
inspection techniques to service a CV carburetor.
1. Remove carburetor diaphragm chamber cover
with a ratchet style screwdriver. DO NOT use an
impact driver to remove the screws or carburetor
may be permanently damaged.
2. Remove float bowl and carefully remove the
pressed float pin.
Support Here
NOTE: Be careful not to damage the float pin tower
during the float pin removal. Support the float pin
tower while removing the float pin. This helps to
prevent the float pin towers from breaking off.
3. Remove inlet needle seat retaining screw along
with plate, and carefully remove needle seat.
NOTE: Do not use a pliers to remove the seat or
permanent damage may occur.
4. Remove the pilot mixture screw, spring, flat
washer, and O-Ring. If an anti-tamper plug is
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