Zenoah CHTZ2401 Workshop Manual page 22

b. Judgments of the main check valve
c. Throttle valve normality check
Throttle Valve Assembly
7. Carburetor Service Guide
Plastic Pipe
Main Check Valve
Body Assembly
Contact Surface
Plunger
Jet Needle Portion
Damage Wear
● As illustrated, hold a plastic pipe on the check
valve and blow and suck air by your mouth. If the
air is stopped by blowing, and open by sucking, the
valve has no failure.
● In case of failure, soak the valve into gasoline for
about 10 minutes and repeat blowing and sucking
several times.
If this is not successful, replace the body assembly.
● Make sure to check the valve in case fuel is not
supplied though the priming pump is operated.
● Check that no wear exists in the throttle valve slide.
Carefully slide a screw driver tip along the plunger's
contact surface.
If the screw driver tip catches in a groove, replace
the carburetor assembly with a new one.
● Check that no wear exists on the jet needle.
If there are signs of vertical linear flaws or wear,
replace the carburetor assembly with a new one.
Caution:
Even small damage will increase fuel
consumption.
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