O.S. Engines 18TM Revo - Manual (Page 25)

5. Finally, when cleaning the exterior of the
engine, use methanol or kerosene. Do not
use gasoline or any solvent that might
damage the silicone fuel tubing.
Caution:
The rear crankshaft bearing of this engine
uses a special plastic retainer. If the front
housing needs to be heated to remove or
replace the bearing, do not allow the
bearing to exceed 120C (248F), otherwise
it may be damaged and rendered
unserviceable.
Dirt and dust may lodge in
Installing Dust Caps
When storing the engine, install the cap on
the exhaust port, carburetor, etc. to prevent
dust from entering the engine.
marked places.
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