Well, here I am again, a year later and I'm back to the same problems. Here is last year's thread if it helps. http://www.lawnsite.com/showthread.php?t=77717&page=1&pp=10&highlight=Problem Both have been up to their old tricks of harassing me again. The blower is doing better now after a little work, but the Stihl FS85 trimmer is not. So I'll stick to it for now. It WAS cranking up just fine. But it would not rev up. It would just choke out and die instead. So I went through replacing the fuel delivery lines again. I got it back to going, but it was still finicky and would take spells. In addition, it would die if tilted on it's side to edge. So I converted the fuel lines a bit and went to the heavy Echo style fuel filter. This is because the Stihl ones tend to want to float. So I figured that might be why it was croaking on me when tilted. Well still no dice and the rev issue started to return. So I figured I'd replace the carb. (ZAMA) But after calling around, nobody had it in stock. So I compromised to rebuild the current one and install a new carb kit. Once I opened it, I saw that the needle assembly set screw had rusted and no new one was included in the kit. So I cleaned the carb real good and got the rust off the set screw. Afterwards I started installing the kit. I could not get the welch plugs out and did not want to screw anything up. So I installed the new needle assembly and the new screen. Then I replaced the gaskets, diaphrams, ect, and installed a new primer bulb. Then put the carb back on with all new gaskets for the contact surfaces. The first thing I noticed is that the new primer bulb would get gas, but would not fill up full like the old one did. So during the process I think I flooded it with the primer bulb. Time for a new spark plug. I put that in and got it running again. But it was short lived and started to take longer and longer for it to warm up enough to rev. In addition it started to get hard to crank again, despite my efforts to be careful with the primer buld. Later, I noticed it was starting to leak fuel from the carb. So I figured the new needle valve assembly was not seating properly. So I went back and put the old one in. After much effort I got it going again and it ran flawlessly a couple of times. But then it started to leak fuel from the carb again. After noticing this it would not crank. So I began to grasp at straws and decided to slowly adjust the L screw out a bit more. Once I brought it out an extra full turn, again the trimmer cranked and ran fine. But when I went to use it again, it was leaking fuel from the carb again. Likewise, it would not crank again. I checked every gasket on the machine and they are all dry also. So now I don't know what else to do. Basically I went from a trimmer that would not rev to one that leaks fuel from the carb and doesn't want to start. So does anyone else have an idea I might try? Or should I put the new carb on order?