From the manual of the O.S. .46:

"1. At the end of each operating session,drain out any fuel that may remian in the fuel tank.

2. Next, 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. Remove the glow plug and eject any residue by rotating the engine with an electric starter for 4-5 seconds while the engine is still warm.

3. Finally, inject some after-run oil into the engine. Rotate the engine a few times by hand, to make sure that it is free, and then with an electric starter for 4-5 seconds to distribute the oil to all the working parts."

O.S. 46 FX manual, page 22 under engine care and maintenance