Fuel System: 1G-25
5) Measure the float height “a” while the float arm is just
contacting the needle valve using vernier calipers.
Bend the tongue “A” as necessary to bring the float
height “a” to the specified level.
Special tool
: 09900–20102 (Vernire calipers)
Float height “a”
13.0 ± 1.0 mm (0.51 ± 0.04 in)
6) Reinstall the float chamber. Refer to “Carburetor
Assembly: ”.
7) Reinstall the carburetor assembly. Refer to
“Carburetor Assembly Removal and Installation: ”.
Carburetor Inspection and Cleaning
B649G11706005
Refer to “Carburetor Assembly: ” and “Carburetor
Disassembly: ”.
Carburetor Parts
Check the following items for any damage or clogging.
If they are clogged, clean the fuel passage.
•Pilot jet
•Main jet
• Main air jet
•Pilot air jet
• Needle jet air bleeding hole
•Float
• Jet needle
• Valve seat
• Piston valve
• Starter (enricher) jet
• Gasket and O-ring
• Throttle shaft oil seal
• Diaphragm
• Pilot outlet and by-pass ports
Needle Valve
Check the needle valve for damage or worn.
If foreign matter is caught between the valve seat and
the needle valve, the gasoline will continue flowing and
overflow. If the valve seat and needle valve are worn
beyond the permissible limits, similar trouble will occur.
Conversely, if the needle valve sticks, the gasoline will
not flow into the float chamber. Clean the float chamber
and float parts with gasoline. If the needle valve is worn,
as shown in the illustration, replace it along with a new
valve seat.
Throttle Valve
Check the throttle valve moves smoothly from full open
to full close. If it does not smoothly, clean the carburetor.
Cleaning
WARNING
!
Some carburetor cleaning chemicals,
especially dip-type soaking solutions, are
very corrosive and must be handled carefully.
Always follow the chemical manufacturer’s
instructions on proper use, handling and
storage.
1) Clean all jets with a spray-type carburetor cleaner
and dry them using compressed air.
“a”
I649G1170058-01
“A”
I649G1170059-01
CORRECT INCORRECT
I649G1170060-01
I649G1170063-01
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