This item is an authentic repair kit that is sourced from the original manufacturer to be used with Homelite chainsaws. The carburetor is used to supply the engine with a mixture of air and fuel in a proper ratio. Over time ethanol in gasoline can build up deposits and clog fuel passageways. This will lead to an improper fuel ratio causin...Read moreg the engine to idle at fluctuating RPM's, or can cause the engine to run then abruptly stop, or not start at all. If this occurs cleaning and rebuilding the carburetor may be necessary. This kit includes all the recommended parts to be replaced when repairing a carburetor. Refer to the appropriate diagrams for your model to ensure the correct repair procedure.