O.S. Engines FS110-a - Manual (Page 12)

22
MIXTURE CONTROLS
RELOCATION OF CARBURETOR CONTROLS
Carburetor Retaining Screw
Intake Manifold
Retaining Screw
Remove the intake manifold retaining
screws and carburetor retaining screws. 1.
The carburetor can be turned 180 to
reverse the needle-valve and throttle lever
position.
2. Rotate the intake manifold 180 gently
without removing the carburetor from the
intake manifold.
Re-install the intake manifold and carburetor
retaining screws. Make sure the fitting faces
are clean. Do not over-tighten the screws. 3.
23
TYPE 60Y CARBURETTOR
The sequence in which these controls are
adjusted is explained in the succeeding
sections, under Starting, Running-in and Idle
Adjustment.
The Needle Valve
When set to produce maximum power at full
throttle, this establishes the basic fuel/air
mixture strength. The correct mixture is then
maintained by the carburetor's built-in
automatic mixture control system to cover
the engine's requirements at reduced throttle
settings.
The Mixture Control Valve
This meters fuel flow at part-throttle and idle
speeds to ensure reliable operation as the
throttle is opened and closed. The Mixture
Control Valve is factory set for the
approximate best result. First run the engine as
received and readjust the Mixture Control Valve
only if necessary.
Two mixture controls are provided on this
Carburetor.
Needle Valve
Mixture Control
Valve
Air Funnel
Throttle Lever
Fuel Inlet
Rotor Guide Screw