5. FUEL SYSTEM
5-12
ATV 50
AIR SCREW ADJUSTMENT
Turn the air screw clockwise until it seats
lightly and back it to the specification given.
Start the engine and turn the air screw in or
out slowly to obtain the highest engine
speed.
Turn the throttle stop screw to obtain the
specified idle speed.
Idle Speed: 1800±100 rpm
Air Screw Opening: 2 ± 1/2 turns
Slightly increase the engine speed and make
sure that the engine does not miss or run
erratic.
If the adjustment of the air screw within the
range of ±1/2 turn makes no difference to the
engine performance, check other related
items.
Air Screw
Throttle Stop Screw
Do not force the air screw against its
seat to prevent damage.
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