Operation Manual

35MS 241 C
6.2 Leak testing
Defective oil seals and gaskets or
cracks in housing are the usual
causes of leaks. Such faults allow
supplementary air to enter the
engine and upset the fuel-air
mixture.
This makes adjustment of the
prescribed idle speed difficult, if not
impossible.
Moreover, the transition from idle
speed to part or full throttle is not
smooth.
Always start with the vacuum test
and then continue with the pressure
test.
The engine can be thoroughly
checked for leaks under vacuum
and at gauge pressure using the
pump 0000 850 1300.
6.2.1 Preparations
– Remove shroud, b 6.4
– Take off the spark plug boot and
remove the spark plug
– Set the piston to the top
dead center (this can be checked
through the spark plug hole)
– Remove the decompression
valve, b 6.9
: Fit the stopper (1) 1122 025 2200
and screw it tight
: Screw in spark plug (2) and
tighten it securely
– Remove muffler and gasket,
b 6.1
: Position flange (1)
5910 855 4201 on cylinder
exhaust port
: Screw in screws (2)
– do not tighten
2410RA075 TG
2
1
2410RA076 TG
2 2
1
The flange (1) 4224 893 2501 can
be reworked as shown.
a=13 mm
b=39.25mm
c=6mm
: Slide sealing plate (1)
0000 855 8106 between cylinder
exhaust port and flange (2)
: Tighten screws (3) lightly
The sealing plate must fill the full
width between the screws.
– Carefully pull out the carburetor
over the studs and lay it aside
– Do not overextend fuel hose,
b 8.4
c
b
2710RA164 TG
a
2410RA077 TG
1
3
2
3