Carburetor trouble can be caused by
or improper fuel level in the float chamber.
A dirty or damaged air cleaner can also alter the fuel
Mixture Trouble Symptoms
Poor runn ing
Exhaust smokes excessively
Frequent backfiring in the exhau st system
during engine braking
The following explanation covers the cleaning and
inspection of the carburetor.
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pressed air, or they will be damaged.
2. Remove as many rubber or plastic parts from the car-
bureton as possible before cleaning the carbureton
with a cleaning solution.
This will prevent damage
or deterioration of the parts.
3. The carburetor body has plastic parts that cannot be
DO NOT use a strong carburetor cleaning
solution which could attack these
a mild cleaning solution safe for plastic parts.
Do not use wire for cleaning as this could damage the
Disassemble the carbu
Wash the di sassembled
and air and fuel passages with a high flash -point
solvent then blow them clean with compressed
use a bath of automotive type carburetor
and replace if damaged
needle is worn as shown in the d iagram
replace the valve
needle and valve seat as a set.
Remove the pilot screw (See Pg. 52), and check that
the tapered portion of the pilot screw is not worn or
otherwise deformed. If it is, replace the screw.
A. Tapered Portion
Visually inspect the diaphragms of the vacuum
pistons and coasting enricher.
If there is any damage,
the diaphragm should be replaced.
A. Vacuum Piston Diaphragm
B. Coasting Enricher Diaphragm
Check the jet needle and needle jet.
jet and jet needle should be replaced.
NOTE: The last number of the jet needle number ("3"
of 5P3-3 or 5P2-3) is not stamped on the needle, but is
Serv ice Fuel Level