O.S. Engines 18TM Revo User Manual
Page 12

CARBURETOR CONTROLS
Four adjustable controls are provided on
this carburetor.
Needle Valve
Throttle Stop
Screw
Mixture Control Valve
Thermo Insulator
Metering Needle
The Needle-Valve;
For adjusting the mixture strength when the
throttle is fully open.
The Mixture Control Valve:
For changing the mixture strength at mid
speed and acceleration. (Do not rotate the
screw more than one turn.)
The Metering Needle:
For adjusting the mixture strength at part-
throttle and idling speeds, to obtain steady
idling and smooth acceleration to mid
speeds.
The Throttle Stop Screw:
For setting the minimum idle speed:
NOTE: Readjustment may be necessary,
occasionally to allow for changes in fuel
formula gear ratio or clutch engagement
point.
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