If it is necessary to re-adjust, turn the T-screw clockwise while the engine is running, until the chain starts to rotate.

Carburetor adjustment Due to existing environmental and emissions legislation your chain saw is equipped with movement limiters on the carburetor adjuster screws.

These limit the adjustment possibilities to a maximum of a 12 turn.

Your Husqvarna product has been designed and man ufactured to specications that reduce harmful emissions.

Function The carburetor governs the engines speed via the throttle control.

Correct adjustment is essential to get the best performance from the machine.

Carefully follow the instructions below, using a tachometer as an aid.

The setting of the carburetor means that the engine is adapted to local conditions, for example, the climate, altitude, fuel and the type of 2-stroke oil.

The carburetor has three adjustment controls: - L Low speed jet - H High speed jet - T Idle adjustment screw The L and H-jets are used to adjust the supply of fuel to match the r ate that air is admitted, which is controlled with the throttle.

If they are screwed clockwise the airfuel ratio becomes leaner (less fuel) and if they are turned anti-clockwise the ratio becomes richer (more fuel).

A lean mixture gives a higher engine speed and a rich mixture gives a lower engine speed.

If the T-screw is turned clockwise this gives a higher idle speed; turning it anti-clockwise gives a lower idle speed.

Basic settings and running in The basic carburetor settings are adjusted during testing at the factory.

CAUTION If the chain rotates while idling the T-screw must be turned anti-clockwise until the chain stops.

Rec. idle speed: 2700 rpm Fine adjustment When the machine has been run-in the carburetor should be nely adjusted.

First adjust the L- jet, then the idling screw T and then the H-jet.

Conditions Before any adjustments are made the air lter should be clean and the cylinder cover tted.

Adjusting the carburetor while a dirty air lter is in use will result in a leaner mixture next time the lter is cleaned.

Do not attempt to adjust the L and H jets beyond either stop as this could cause damage.

Now start the machine according to the starting instructions and let it warm up for 10 minutes.

Place the machine on a at surface so that the bar points away from you and so that the bar and chain do not come into contact with the surface or other objects.

Low speed jet L Turn the low speed jet L clockwise until it stops.

If the engine accelerates poorly or idles unevenly, turn the low speed jet L anticlockwise until good acceleration and idling are achieved.

Fine adjustment of the idling speed T Adjust the idle speed with the T-screw.

Husqvarna 353 Repair Manual