O.S. Engines 21VG-PX - Manual (Page 18)

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Then, inject some after-run oil into the engine, and
rotate the engine with an electric starter or the
recoil starter for 4 to 5 seconds to distribute the oil
to all the working parts.
Finally, when cleaning the exterior of the
engine, use methanol. Do not use gasoline
or any solvent that might damage the silicone
fuel tubing.
Note:
Do not inject after-run oil into the carburetor as
this may cause the O-rings inside the carburetor
to deteriorate. These procedures will reduce the
risks of starting difficulties or corrosion after a
period of storage.
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The minute particles of foreign matter, that are present
in any fuel may, by accumulating and partially
obstructing fuel flow, cause engine performance to
become erratic and unreliable.
O.S. 'Super-Filters' (large and small) are available, as
optional extras, to deal with this problem.
One of these filters installed to the pickup tube inside
your refueling container, will prevent the entry of
foreign material into the fuel tank. It is also
recommended that a good in-line filter be installed
between the tank and carburetor.
Dirt and dust may lodge in marked places.
CHECKING THE ENGINE
If the engine suffers a loss of performance after a
long period of running it may be due to the wearing of
parts. It is suggested that the worn parts be replaced
when the following symptoms are detected.
Engine sound changes and easily overheats.
Power has dropped considerably.
Idle is unstable and/or engine tends to stop
at idle.
In most cases, ball bearings, cylinder & piston assembly,
connecting rod and/or crankcase have become worn
out or abnormal. Check the parts carefully and replace
them if necessary.