Ok so I have a Troy- Built 4 cycle gas trimmer (TB575). It will start and run till you give it gas. Then it is like you hit the kill switch. Now I read up on this and the carb is a real weak point and they don't make a rebuild kit for it. So last year I dropped $80 on a new carb, gasket, and tubing along with a new fuel filter and air filter. I put it all back together and what do you know still does the same thing. Anyone got any clue about this. I changed the gas first used sta-bil in the new gas and blowing out the tubing and carb before buying the new one. I just don't know what the problem is. I don't want to take it to the shop because that will cost me $100+ and it just isn't worth that much. I got so upset last year I went and just purchased a Echo SRM-230 gas trimmer. The Echo is the HOA's along with an Echo blower and an Echo chain saw.