O.S. Engines 12XZ Speed Spec II - Manual (Page 14)

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CARE AND MAINTENANCE
1.
2.
3. 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.
Do not forget to clean the filters regularly to
remove dirt and lint that accumulate on the
filter screens. Also, clean the carburetor
itself occasionally.
At the end of each operating session, drain out
any fuel that may remain in the fuel tank.
Afterwards,energize the glow-plug and try to
restart the engine, to burn off any fuel that may
remain inside the engine. Repeat this
procedure until the engine fails to fire. Do this
while the engine is still warm.
4. Then, inject some after-run oil into the
engine, and rotate the engine with an
electric starter for 4 to 5 seconds to
distribute the oil to all the working parts.
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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Dirt and dust may lodge in marked places.
CHECKING THE ENGINE
If the engine will not develop normal performance
after a long period of running due to wearing of
parts. It is suggested to replace necessary
parts when the following symptoms are detected.
Engine sound changes and easily overheats.
Power has dropped excessively.
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 damaged. Check the
parts carefully and replace them if necessary.
Crankshaft of this engine is filled with
silicone. Do not use light oil nor
kerosene, etc. for washing, or the silicone
will swell. Use alcohol or fuel for washing
and dry it completely.
Note:
5. Finally, when cleaning the exterior of the
engine, use methanol or a household
cleaning agent. Do not use gasoline,
kerosene, or any petroleum based chemical
which can damage silicone fuel tubing.