Fuel and air are the lifeblood of an engine. If either is restricted too much, the engine carburetor could degrade on performance. As the service time goes on, the debris may more or less block the passages inside the engine to change the air-fuel mix ratio through the carburetor. Therefore, you must adjust the carburetor to correct the engine's running condition at idle.

Here, we’ll take a Husqvarna 372XP as an example to walk you through how to adjust the carburetor on the chainsaw with a set of professional Hipa carburetor adjustment tools. After looking through this blog, you will learn how to adjust your carburetor to its best performance and bring your equipment back to its previous glories.

Position Adjustment Screws

First, you should target the location of the idle mixture and idle speed screws. You can see the picture for the location of the idle mixture screws on the carburetor of Husqvarna 372XP chainsaw.

Adjust the Air-Fuel Mixture

Here are two methods for adjusting the idle mixture screws:

Adjust with a “一” shaped screwdriver

In the beginning, you need to stick the left screw cap in using a “一” shaped screwdriver, which does not have a limiter cap, and turn it in or out.

Then, turn the right screw that has a limiter cap like the other screw you had proceeded, and you will be blocked during the half-turn by the limiter cap. 

If you want to continue to adjust, you need another regular screwdriver. One pushes down on the gap between the screw and the limiter cap, and another unscrews. Like this: 

It is really a hard task to use two screwdrivers. But everything is different as there is a professional screwdriver.

Adjust with a professional screwdriver from Hipa

Simply, use the 7 or 21-teeth screwdriver to push down into the right screw and turn it in as you had proceeded on the left screw.

If the screw is blocked by the limiter cap, you have to unscrew the right screw until you are able to put off the limiter cap.

And then, push the cap in from the bottom of the spline with the splined driver.

Finally, put all parts back on and turn the right screw in as you had proceeded on the left screw.

Product Recommendation

1. HIPA 2-Stroke Carburetor Adjustment Kit

Hipa's parts kits make it quick and easy to maintain or restore your lawn and garden equipment. Whether you need replacement parts, tools, or help, Hipa has the small machine solution for you.