25MS 210, MS 230, MS 250
: Fit the test flange (1)
1118 850 4200 in place of the
carburetor.
: If decompression valve is fitted,
pull out the button.
– Check that spark plug is properly
tightened down.
– Perform leakage test with tester
1106 850 2905 and vacuum
pump 0000 850 3501.
– Carry out preparations –
b 6.2.1.
: Connect pressure hose of tester
1106 850 2905 to nipple on test
flange.
: Close the vent screw (1) on the
rubber bulb.
– Pump air into the engine housing
with the rubber bulb until the
gauge indicates a pressure of
0.5 bar (7.25 psi). If this pressure
remains constant for at least
VA
143RA046
1
20 seconds, the engine or
decompression valve, if fitted, is
airtight.
: However, if the indicated
pressure drops, the leak must be
located and the faulty part
replaced.
To find the leak, coat the suspect
area with oil and pressurize the
engine again. Bubbles will appear if
VA
208RA007
a leak exists.
– If the decompression valve is
leaking, fit a new one – b 6.9.
– Repeat the pressure test.
– Carry out the vacuum test –
b 6.2.3.
– After finishing the test, open the
vent screw and disconnect the
hose.
– Remove the test flange.
– Install the carburetor –
b 11.2.2.
– Remove the flange.
– Remove the sealing plate.
– Install the muffler – b 6.1.
6.2.2 Pressure Test
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