O.S. Engines FS-40S-CX - Manual (Page 8)

ENGINE INSTALLATION
Make sure that the vehicle's engine mounting
surfaces are level and in the same plane. Poor
installation may cause distortion of the crankcase,
bearings, etc., resulting in erratic running and loss
of performance. The recommended screws for
securing the engine are 3.5mm or 4-40 steel Allen
hexagon socket type. If existing holes in the
engine mount do not align perfectly with engine
Chassis
Chamfer inside edges of bearers.
mounting lugs, enlarge them slightly with a needle-
file so that screws enter vertically.Avoid forcing the
screws.
INSTALLATION OF THE CARBURETOR
As delivered, the engine has its carburetor lightly
fit into the intake boss. Secure it as follows.
Loosen the retainer screw,and remove the
carburetor. Place the rubber gasket at bottom
of the intake boss, and rotate the carburettor
to its correct position and make sure that it is
pressed well down into the intake boss,
compressing the rubber gasket, before
retightening screw.
Rotate the retainer screw gently until it stops,
then tighten a further 60-90˚.
Do not overtighten the screw as this will
damage the carburettor body.
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