I bought a Toro Trimmer last year, and it was probably my biggest mistake ever
I constantly have problems with it, and I think it's all the carb. I have experience with running 2 cycle engines, and know how to start them. When I start this one, it'll start fine, and I let it run for 30 seconds, then if I hit the throttle, it will die. Then I can get it started and it'll only run with the throttle down and as soon as I let go it dies. Then after like 5-10 minutes of restarting and revving the engine at various speeds, it'll work fine. But then after 10 minutes of use the gas starts to saturate the air filter and drip down onto the muffler then burns and smokes. I know the air filters usually get gas on them, but this is a lot more gas than usual, and dripping onto the muffler concerns me.
There are two adjustment screws that are phillips head. One adjusts how much the butterfly valve stays open after you release throttle, and the other seems to adjust the idle speed. I've tried many different adjustments and some work great, for a while, then it runs like garbage again. There are also two things that look like they can be adjusted at the top of the carb. They are semi-circle shaped with no slots for a screw-driver, so I don't know how/if they can be adjusted.
At the end of last season, on the second use of it, the flywheel bolt came off. And I brought it to the shop to get fixed. This is definitely the biggest, and more expensive, pieces of fertilizer I've bought. So this time I'm hoping I can fix it without having to pay for it to be done, so I don't waste more money on it.