O.S. Engines 21RG-MX - Manual (Page 14)

Set the needle-valve. Turn the needle clockwise
slowly, without forcing, until it stops.
Then, reopen the needle-valve 2-1/2turns counter-
clockwise.
Open the throttle very slightly:
Turn needle-valve clockwise to
close (for leaner mixture)
Turn needle-valve counterclock-
wise to open (for richer mixture)
This is to avoid unnecessarily
high revolutions when the en-
gine starts.
Mark
Close
Open
STARTING & INITIAL RUNNING-IN('Breaking-in')
For long life and high perfomance, every engine
needs to be 'run-in' or 'broken-in'. With care, running-
in of the engine can be carried out with it installed in
the boat. Be sure to use a muffler-pressurized fuel
system.
◆
◆
When starting the engine, put the hull on a stand, etc.
out of the water.
■ In case of the 21RG-M
◆ Priming
Turn the flywheel by hand to draw the fuel to the
fuel inlet.
Turn the flywheel two more revolutions to draw the
fuel inside the engine.
•
•
•
NOTE (IMPORTANT)
The quantity of fuel drawn into the engine by
priming is an important factor in starting the
engine successfully. When the engine is being
started for the first time, turn the flywheel two
revolutions after fuel reaches the fuel inlet, as
described above. However, when re-starting the
engine immediately after a run, one revolution, or
even no priming at all may be required. The
engine's requirements will be quickly learned with
experience.
Open the throttle fully and place your finger over
the carburetor to choke intake.
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