O.S. Engines 50SX-H - Manual (Page 9)

Front view
CORRECT
Side view
Top surfaces are in the same plane.
Re-align the surfaces as necessary
INCORRECT
Top surfaces are not
in the same plane. Top surfaces are not in the
same plane.
Engine does not rest firmly.
BEFORE STARTING
Tools, accessories, etc.
The following items are necessary for operating the
engine.
1 Fuel
Model glowplug engine fuel of good quality, preferably
containing a small percentage of nitromethane.
Make sure that only the under-surfaces
of the engine’s mounting lugs are in
contact with the engine mount.
Please note that crankcase volume of
the 50SX-H is a little larger than the
46FX-H’s.
If the crankcase body touches the
mount, chamfer the edges of the mount.
As delivered, the engine has its carburetor lightly
fitted into its intake boss. Secure it as follows.
INSTALLATION OF THE CARBURETOR
Retainer
screw
Carburetor Rubber
Gasket
0.2mm gap
Loosen the retainer screw, rotate the carburetor to
its correct position and press it well down into the
intake boss, compressing the rubber gasket as
shown in the sketch, before re-tightening screw.
Rotate the retainer screw gently until it stops, then
tighten a further 90-120 degrees. Do not over-
tighten the screw as this will damage the thermo-
insulator.
1.
2.
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