5-20 FUEL AND LUBRICATION SYSTEM
CORRECT INCORRECT
CARBURETOR CLEANING
!
Some carburetor cleaning chemicals, especially diptype
soaking solutions, are very corrosive and must be
handled carefully. Always follow the chemical
manufacturer’s instructions on proper use, handling and
storage.
• Clean all jets with a spray-type carburetor cleaner and dry them
using compressed air.
• Clean all circuits of the carburetor thoroughly – not just the
perceived problem area. Clean the circuits in the carburetor
body with a spray-type cleaner and allow each circuit to soak if
necessary to loosen dirt and varnish.
Blow the body dry using compressed air.
#
Do not use a wire to clean the jets or passageways. A
wire can damage the jets and passageways. If the com-
ponents cannot be cleaned with a spray cleaner, it may
be necessary to use a dip-type cleaning solution and al
low them to soak. Always follow the chemical
manufacturer’s instructions for proper use and cleaning
of the carburetor components.
• After cleaning, reassemble the carburetor with new seals and
gaskets.
CARBURETOR INSPECTION
Check the following items for any damage or clogging.
* Pilot jet * Float * Starter (enricher) jet
* Main jet * Needle valve * Gasket and O-ring
* Main air jet Jet needle * Throttle shaft oil seal
* Pilot air jets * Valve seat * Pilot outlet and by-pass ports
* Needle jet air bleeding hole * Piston valve * Coasting valve
NEEDLE VALVE INSPECTION
If foreign matter is cought 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. Clean the fuel passage of the mixing chamber using com-
pressed air.
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