husqvarna 51?

The first thing you should check is the compression. If you don't have a tool just take it to a small engine mechanic and I'm sure that they could check it real quick for you. it shouldn't be below 70 psi, if it is you need new rings.

Jim
October 2008

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