Losi LOSR1901 - Manual (Page 19)

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AIR FILTER
Use and proper care of the air filter are essential for engine
longevity and performance. Soak the air filter with a good
quality oil, such as the one usually supplied with the filter.
Without the air filter, dust and dirt can enter the engine,
possibly damaging the engine.
Always use an air filter when running the
engine.
CARBURETOR
The carburetor supplied with the engine is pre-set for the
break-in procedure. After the break-in procedure is
completed, it must be adjusted for normal use conditions.
Carburetors have 4 adjustments available:
High speed needle, top screw: adjusts the fuel flow when
the throttle is fully opened. Turning this needle clockwise,
you will lean out the mixture; turning counter clockwise you
make the mixture richer.
Low speed needle, screw at the end of carburetor
slide: tunes acceleration from idle, regularizes the idling.
Turning this needle clockwise, you lean out the low speed
mixture. Turning counter clockwise you make the mixture
richer.
Idle screw, the small screw on the side at an angle:
Stops the carburetor slide from closing completely, sets the
engine idling. Turning this needle clockwise increases the idle
RPM; turning it counter clockwise decreases the idle RPM.
This screw and the low speed needle are to be used together
to adjust the engine idling.
Spray bar, on the back of the carburetor: sets the
engine torque in normal use. If you are not a very
experienced user, we recommend that you leave this at the
factory setting or move it no more than a half turn with
respect to the original position.
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