Mixture Controls - O.S. engine Alpha Series Owner's Instruction Manual

RELOCATION OF CARBURETOR CONTROLS
The carburetor can be turned 180
reverse the needle-valve and throttle lever
position.
1.
Remove the intake manifold retaining
screws and carburetor retaining screws.
2.
Rotate the intake manifold 180 gently
without removing the carburetor from the
intake manifold.
3.
Re-install the intake manifold and carburetor
retaining screws. Make sure the fitting faces
are clean. Do not over-tighten the screws.
TYPE 60Y CARBURETTOR
Two mixture controls are provided on this
Carburetor.
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
approximate best result. First run the engine as
received and readjust the Mixture Control Valve
only if necessary.

MIXTURE CONTROLS

to
Intake Manifold
Retaining Screw
Carburetor Retaining Screw
22
Rotor Guide Screw
Throttle Lever
The sequence in which these controls are
adjusted is explained in the succeeding
for the
sections, under Starting, Running-in and Idle
Adjustment.
23
Fuel Inlet
Mixture Control
Valve
Needle Valve
Air Funnel