FUEL SYSTEM
PB-8010, EB810
30
4-7 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.
Using Pressure tester 897803-30133 (A)
1. Open fuel cap. Then, pull off outer fuel line (B)
from carburetor.
2. Connect Pressure tester 897803-30133 (A) to
carburetor fuel inlet (C).
3. Apply pressure approx. 100 kPa (1.0 kgf/cm
2
)
(14 psi).
4. If the pressure remains steady, follow step 5
and 6. If the pressure drops, proceed to step 7.
5. Lightly push purge bulb. The pressure tester
reading should drop and remain above 50 kPa (0.5
kgf/cm
2
) (7 psi).
6. If the reading does not drop, inspect inlet needle
valve for sticking or metering lever height.
7. If the pressure drops at step 3, or if the pressure
drops below standard figure at step 5, remove
carburetor from the unit (Refer to “4-6 Replacing
carburetor”).
8. Submerge carburetor in suitable clean solvent to
locate the leak by applying pressure approx. 100
kPa (1.0 kgf/cm
2
) (14 psi).
9. If air bubbles come out between pump body
(d1) and carburetor body (d2), inspect pump dia-
phragm, pump gasket, and diaphragm seat of
carburetor body (Refer to “4-11 Inspecting dia-
phragm and others”).
10. If air bubbles come out from throttle bore
(d3), inspect inlet needle valve, metering lever
spring, and metering lever height (Refer to “4-10
Inspecting inlet needle valve” and “4-9 Inspecting
metering lever height).
A
B
C
d3
d1
d2
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