FUEL SYSTEM
CS-2511TES
251Ts, 251TCs
37
4-9 Testing carburetor
NOTE:
To perform this test, carburetor interior
should be wet with fuel. If dry, a little leakage may
occur.
1. Remove dust cover.
2. Disconnect fuel line (A) from black joint (B).
Connect pressure tester 897803-30133 (C) to joint
(B).
3. Apply pressure approx. 100 kPa (1 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 once. Pressure tester
reading should drop and remain above 50 kPa (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 as step 8, 9 and 10.
8. Remove air cleaner cover and air filter.
9. Remove two bolts (D), carburetor elbow (E) and
carburetor (F).
10. Disconnect purge line (G) and throttle rod (H)
from carburetor (F).
11. Submerge carburetor in suitable clean solvent
to locate the leak by applying pressure approx. 100
kPa (1 kgf/cm
2
) (14 psi).
12. If air bubbles come out between pump cover
and carburetor body (J), inspect pump diaphragm,
pump gasket, and diaphragm seat of carburetor
body (Refer to “4-13 Inspecting diaphragm”).
13. If air bubbles come out from throttle bore (K),
inspect inlet valve, metering lever spring, and me-
tering lever height (Refer to “4-12 Inspecting inlet
needle valve”).
14. Reassemble removed parts (Refer to “4-15 In-
stalling carburetor ).
A
B
C
J
K
E
G
H
D
F
