5.13
FUEL SYSTEM
Carburetor Assembly
1. Replace parts in proper order. Refer to the parts exploded
view or “Disassembly” steps for further detail
2. Install the pilot air mixture screw, spring, washer, and Oring
as an assembly (Mikuni Only). Lubricate the O-Ring with oil
or light grease before installation. Turn the screw in until it
lightly contacts the seat. Back out the specified number of
turns.
NOTE: The final air mixture screw must be adjusted
with the engine running.
Air Screw Base Setting
(Set at Factory)
Factory Specification:
50cc Mikuni: 2.5 Turns Out
Needle and Seat Leak Test
1. Install the float bowl.
2. Invert the carburetor and install a Mity-Vac™
(PN 2870975) to the fuel inlet fitting.
3. Apply 5 PSI pressure to inlet fitting. The needle and seat
should hold pressure indefinitely. If not, inspect needle and
seat and seat O-ring or gasket.
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