29MS 201, MS 201 C, MS 201 T, MS 201 TC
6.2 Leakage Test
Defective oil seals and gaskets or
cracks in castings 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 perform the vacuum test
first and then the pressure test.
The engine can be checked
thoroughly for leaks with the pump
0000 850 1300.
6.2.1 Preparations
– Disengage the chain brake and
remove the chain sprocket cover,
bar and chain.
The preparations are the same for
the MS 201 and MS 201 T even
though their handle housings and
the position of the carburetor are
different.
– Pull the boot off the spark plug.
: Unscrew the spark plug (1).
– Set the piston to top dead center.
This can be checked through the
spark plug hole.
: Fit the spark plug (1) and tighten
it down firmly.
– Remove the muffler, b 6.1
: Fit the test flange (1)
5910 855 4201.
: Fit the screws (2).
7013RA056 TG
1
7013RA057 TG
2
1
2
: Slide the sealing plate (1)
0000 855 8106 between the
cylinder exhaust port and flange
and tighten down the screws
(arrows) moderately.
The sealing plate must completely
fill the space between the two
screws.
– Remove the carburetor,
MS 201 b 12.4,
MS 201 T b 12.5
The recesses (arrows) must fit over
the bushings.
Screw (1) must be in place – it seals
the impulse hose.
7013RA058 TG
1
7013RA059 TG
1
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