If the carburetor’s level of tweaking required for a new or refurbished carburetor is much higher than usual, it might be better to begin by making fuel adjustment settings. This can be achieved by slowly adjusting the primary screws onto the main steadfast ports. Proper care has to be taken while screwing the bolts back onto their holsters due to the fact that the fastening steadfast posts are prone to damage when the screws are rotated too firmly. These very seating ports are more prone to breakage and if damaged, it will result in the entire carburetor having to be replaced. Ensure that fuel tank is over half full. Adjusting the carburetor when the tank doesn’t have sufficient fuel may cause you to set a richer mixture than necessary while adjusting it with too much fuel will result in the other way around. Turn the engine on and allow the chainsaw to idle for a few moments because carburetor adjustments must not be made on a cold engine. This will result in the mixture being too rich when the engine reaches optimum operating temperature. You should aim to set the maximum idling speed at somewhere in the region of 2700 RPM. If a tachometer is not available to you, aim to set the idling speed at such a level that the saw is capable of idling at a maximum possible setting without having to engage its clutch. Also remember to set the fuel adjustment level for lower speeds. You can do so by slowly turning the knob until the engine begins to starve of fuel and keep note of this setting that the screwdriver has been slotted in. Now you may allow the engine to run better by further adjusting the main screw. Ensure that the setting is midway between rich and lean settings.