Leakage Test; Preparations - Stihl MS 200 Service Manual

1
Use a new exhaust gasket.
: Fit the exhaust gasket (1).
1
: Carefully push the muffler (1) into
position.
– Check that the exhaust gasket
(arrow) has not shifted.
– Fit the screws with washers and
check correct position of exhaust
gasket again.
– Insert screws and tighten them
down firmly.
– Reassemble all other parts in the
reverse sequence.
– Tightening torques, b 3.5
MS 200, MS 200 T
8.2

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.
8.2.1

Preparations

The preparations are the same for
the MS 200 and MS 200 T even
though their handle housings and
the position of the carburetor are
different.
1
– Remove the chain sprocket
cover, bar and chain, b 5
– Pull off the spark plug boot.
: 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.
– Tightening torques, b 3.5
– Remove the muffler, b 8.1
2
2
– Fit the flange (1) 1123 855 4200.
– Fit the spacer sleeves (2) 1124
893 7100.
: Fit the M5 x 65 screws (arrows).
1
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