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The use of nitromethane in the fuel can also
contribute to the problem. As a primary
defense, users are advised to avoid running
the engine on too lean a mixture - i.e. do not
close the needle-valve and the airbleed
screw too much.
• Do not leave unused fuel in the engine at the
conclusion of a day's flying. Accepted
practice is to cut off the fuel supply while the
engine is still running at full throttle, then
expel as much fuel residue as possible by
turning the engine over 5-10 seconds with
the electric starter. Finally, inject some after-
run oil through the glowplug hole and turn the
engine over several times by hand.
• When the engine is not to be used for some
months (for example, as between flying
seasons), a worthwhile precaution is to
remove it from the airframe and, after
washing off the exterior with alcohol (not
gasoline nor kerosene), remove carefully the
carburetor with intake pipe, glow plug and all
silicone tubing and put them safely aside.
Then, immerse the engine in a container of
alcohol.
Rotate the crankshaft while the
engine is immersed. If foreign matter is
visible in the alcohol, rinse the engine again
in clean alcohol. Finally, shake off and dry
the alcohol ,and inject some after-run oil from
glowplug hold and rotate the crankshaft
several times by hand. Re-fit the carburetor
with intake pipe and glowplug with the engine
and keep it dry place after putting in a vinyl
bag.
37
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