Bizarre problem, that's contagious...

Hey Guys, I have a Stihl chain saw that's been giving me a hard time lately. It starts when it's cold, but not hot. Any suggestions? I've had it to the shop three times and it won't hold a repair. It's good when it comes home but it starts acting up soon afterward. My neighbor has a Echo and I was looking at Husquarna. The Stihl runs great when it starts, but I have a real problem with it when it's hot. Is it the gas?
Terry
 
If you have ever had the crap gas in a small engine, then the carb probably needs new rubber parts. Many chainsaws, generators, etc. have diaphram parts in the carb to act as a float or fuel pump and the crap gas will do a number on them. As Dave mentioned, it also really plugs up the small holes in the jets.
 
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