Operation Manual

141MS 241 C
Installation
: Position intake elbow (1) against
cylinder
: Insert and tighten down the
screws (arrows)
– Install air guide shroud, b 13.4
Versions with manual fuel pump,
b 13.4.1,
Versions with heating, b 13.4.2
– Install the carburetor support,
b 13.8
– Reassemble remaining parts in
reverse order
13.10 Tank vent
13.10.1 Testing
If problems develop in the
carburetor or fuel supply, the tank
vent must always also be tested and
replaced if necessary. Correct
functioning is determined by testing
the fuel tank under vacuum or at
gauge pressure via the fuel hose.
– Open filler cap and drain fuel
tank, b 1
– Close the filler cap
– Remove the carburetor, b 13.5
2410RA549 TG
1
: Push the connector (1)
0000 855 9200 into the fuel
hose (arrow)
Versions with manual fuel pump
: Close fuel suction hose (1) with a
suitable stopper (2)
Testing with negative pressure
: Slide ring (1) to the left and
connect the pump (2)
0000 850 1300 to the double
nipple (arrow)
– Create vacuum in fuel tank
2410RA558 TG
1
2410RA516 TG
1
2
2410RA517 TG
1
2
Pressure is equalized via the tank
vent. A negative pressure must not
build up inside the fuel tank.
– Clean the area around the tank
vent
– Replace the tank vent or tank
housing if necessary, b 13.10 or
b 13.11.5
Testing with gauge pressure
: Slide ring (1) to the right and
connect the pump (2)
0000 850 1300 to the double
nipple (arrow)
– Create excess pressure in fuel
tank
– Actuate the pump until the
pressure gauge shows a
pressure of 0.5 bar. If this
pressure remains constant for at
least 20 seconds, the tank and
tank vent are airtight. If the
pressure drops, the leak must be
located and the defective part
replaced.
– Reassemble parts in reverse
order
2410RA518 TG
1
2