Echo shindaiwa CSG-7410ES, Руководство по обслуживанию

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FUEL SYSTEM
CSG-7410ES
EC741S
25
D
E
A
B
C
4-4 Testing carburetor
NOTE: To perform this test, carburetor interior
should be wet with fuel. If dry, a little leakage may
occur from diaphragms and/or inlet needle seat.
1. Remove cylinder cover assembly and filter case
(Refer to “4-1 Replacing air filter”).
2. Disconnect fuel line (A) from carburetor.
Connect Pressure tester 897803-30133 (C) to car-
buretor fuel inlet (B).
3. Apply pressure approx. 0.1 MPa (1.0 kgf/cm
2
) (14
psi).
4. If pressure remains steady, follow step 5 and 6.
If pressure drops, proceed to step 7.
5. Lightly push purge bulb. Pressure tester reading
should drop and remain above 0.05 MPa (0.5 kgf/
cm
2
) (7 psi).
6. If reading does not drop, inspect inlet needle
valve for sticking or metering lever height is too
low.
7. If pressure drops at step 3, or if pressure drops
below standard figure at step 5, remove carburetor
from the unit (Refer to “4-5 Removing carburetor,
fuel line and tank vent).
8. Submerge carburetor in suitable clean solvent to
locate the leak by applying pressure approx. 0.1 M
Pa (1.0 kgf/cm
2
) (14 psi).
9. If air bubbles come out between pump cover
and carburetor body (D), inspect pump diaphragm,
pump gasket, and diaphragm seat of carburetor
body (Refer to “4-11 Inspecting pump diaphragm
and inlet screen”).
10. If air bubbles come out from throttle bore (E),
inspect inlet valve, metering lever spring, and
metering lever height (Refer to “4-9 Inspecting me-
tering chamber and inlet needle valve” and “4-10
Inspecting metering lever height).