The fuel quantity required in relation to the air flow, provided by
opening the throttle, is adjusted by the L and H-jets. If they are
screwed clockwise the air/fuel ratio becomes leaner (less fuel)
and if they are turned anti-clockwise the ratio becomes richer
(more fuel). A leaner mixture gives a higher engine speed and a
richer mixture give a lower engine speed.
• The T screw regulates the idling speed. If the screw T is turned
clockwise this gives a higher idling speed; anti-clockwise a lower
idling speed.
Basic setting and running in
The carburettor is adjusted to a basic setting when the saw is
tested at the factory. The basic setting is: H = 1 1/4 turns
respective L = 1 1/4 turns.
Adjust the idling speed with the screw T. If it is necessary to readjust,
first turn the idle speed adjusting screw T clockwise, until
the chain starts to rotate.
Rick in New Zealand, September 2008
