24
Pressure test
If it is not possible to adjust the carburetor
properly, it will be necessary to check the
sealing of the Drive.
To seal off the exhaust side, insert the sealing
plate 1 (944.603.160) between the cover plate
and cylinder. To do this it will be necessary to
loosen the muffler (see under 04 CLUTCH,
page 12, left side of page).
To seal off the intake side, install the sealing
plate 2 (944.603.170) in the place of the
carburetor. To do this it will be necessary to
remove the carburetor (see under 08
CARBURETOR, page 19, left and middle of
page).
Connect the over/underpressure pump to the
connection on the sealing plate 3.
Move the piston to top dead centre.
Set up a pressure of max. 0.3 bar (4,35 psi).
If the pressure drops within 20 seconds, it can
have one of these causes:
• Radial ring (flywheel side) leaking
• Combination bearing (clutch side)
leaking
• Cylinder base gasket leaking
• Crankcase gasket leaking
• Crack in crankcase
• Crack in cylinder
• Starting valve (if present) leaking
• Spark plug leaking
• Rubber intake on cylinder leaking
• Defective pulse line
Note: Detergent can be used to localise leaks.
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