Losi LOSR1901 User Manual

Page 25

Adjusting the idle can affect the bottom end

setting. Check the setting again and if
necessary, repeat the above procedure.

FINAL CARBURETION ON TRACK

The final adjustments have to be made on the track. If the
pre-carburetion has been properly done, only small changes
are needed.
To achieve the best performance, adjust the top end needle
with small increments, repeating the operation until the
engine accelerates in a progressively and reaches the highest
RPM quickly. When the theoretical perfect tuning is achieved,
we suggest to open the top end needle of 1/8 turn to limit
max temperature. This can help avoid a too lean mixture and
in the long term a possible shortening of the engine lifespan.

Power loss and no visible smoke from the exhaust pipe are
signs of bad carburetion. Slow down and revise the top end

needle adjustment by opening it another 1/8 turn. Correct
carburetion delivers good acceleration and produces a sharp
roar at high RPM, with some smoke exiting the exhaust pipe.

Carburetion depends on weather conditions,

glow plug characteristics, fuel type and
exhaust system. Each time one of these

parameters changes, open the top end

needle turn and tune it again on track.

When the engine stalls, high temperature
affects the carburetor and changes the

idling stability, especially when the idling is

too low. The engine tune will be back to

normal after a few laps, when the
temperature reaches normal levels again.

SHUTTING OFF THE ENGINE

When you are done using the engine, disconnect the feeding
pipe and let the engine idle until the fuel inside the engine is
completely depleted.

This manual is related to the following products:

LOSR1900