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The film shows the adjustment of the engine of three saws: Nac, Husqvarna 359 and 346xp. Basics. The film does not use the T screw adjustment - such a large screw can be covered with rubber and invisible. We adjust it only when the adjustment range of the L and H screws is not sufficient and, for example, the chain is turning, the saw has too high RPMs. Then we adjust the T screw, set it to the opening of the main throttle. So if this is the case, we usually gently unscrew it (depending on the design of the levers), then the RPMs will drop and the chain will stop turning. The T screw adjustment was presented in detail in the next film from the Nac series - adjustment for the uninitiated. Here is a link to the page: • NAC petrol saw - carburetor adjustment... Best regards