There could be a number of problems, especially if your saw still has the same fuel in it from last season. Modern day fuel last a maximum of about 6 months in storage before it deteriorates to a point where it affects the starting and performance of your machine. The storage time depends on a few factors but smaller amounts of fuel will deteriorate more quickly especially in chainsaws, lawnmowers, brushcutters etc.
Stale fuel is fuel that has oxidized. As fuel oxidizes it can turn to gum and clog fuel system components and carburetor parts resulting in poor stating and running characteristics. Stale fuel can also damage fuel system components, such as fuel lines and carburetor diaphragms, causing them to perish or harden.
The first thing to do is flush your fuel tank with a fresh 2-stroke fuel / oil mix, purge the system with the primer if equipped, and attempt to restart saw. If you don’t succeed, I would recommend taking your saw to Star Sales & Service for assessment and repair. The saw may require a carburetor service and/or the fuel lines replaced.
To extend the storage life of your fuel, we recommend using a fuel stabilizer. We also recommend running your chainsaw until it runs out of fuel prior to storage.