If yourStihl is hard to start, fix it.
Often it will need rings if it's been used a lot.
Not a hard fix.
How is compression?
A quick dirty test on a saws compression is to reach down and try to
pick it up by the starter cord. If you lift it, it has good compression.
If the cord come out slowly, while you lift it? Well...
If the cord come put and don't lift the saw off the ground? Not good.
First, spark plug.
Second, make sure fuel is available to carb.
Third, pull muffler, look at piston for scuffs.
Fourth, if you get here, new rings, or piston.
