20 Series 4180 Powerhead
Troubleshooting, b 4.4
In the event of trouble with the
carburetor, first check the fuel
supply, b 6.6, and tank vent,
b 6.5
The carburetor can be tested for
leaks with the carburetor and
crankcase tester 1106 850 2905.
– Remove the air filter, b 6.1
– Open the tank filler cap to relieve
pressure.
– Close the tank filler cap.
: Pull fuel hose (1) off carburetor’s
elbow connector.
: Push the fuel hose (1)
1110 141 8600 onto
the nipple (2) 0000 855 9200.
: Push the fuel hose (1) with nipple
(2) onto the carburetor elbow
connector.
– Push the pressure hose of tester
1106 850 2905 onto the nipple.
: Close the vent screw (1) on the
rubber bulb.
: Pump air into the carburetor with
the rubber bulb (2) until the
pressure gauge (3) indicates a
pressure of 0.8 bar.
If this pressure remains constant,
the carburetor is airtight.
– Disconnect pressure hose and
carburetor tester.
– Refit the fuel hoses.
Reassemble all other parts in the
reverse sequence.
However, if it drops, there are two
possible causes:
1. The inlet needle is not sealing
(foreign matter in valve seat, sealing
cone of inlet needle is damaged or
inlet control lever is sticking).
2. The metering diaphragm is
damaged.
In either case the carburetor must
be removed and serviced, b 6.2.
– After completing test, open the
vent screw on the carburetor and
crankcase tester and disconnect
the test hose from the carburetor.
6.2 Carburetor
6.2.1 Leakage test
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