I have a STIHL FS85 and was running fine. Well, I poured in bit of Seaforam into the 50:1 mix in the tank and cranked the machine after 10 min. or so. The machine started up just fine except blue smoke came out at the start up, then got improved during operation, then came out more during idle. The engine also seems to sound and work weaker.... For the smoke: I probably put too much oil in it, so I poured the gas out, put the regular mix of engine oil in. But it still did not fix the problem. I let it run for a while, but no improvement. Tip here ?? For the power: There are TWO Carburetor adjusters. One for Low speed screw and LA IDLE speed screw. I played it with it and now the engine power does not seems to kick power once it had when I go full throttle. I do not have the manual for this model, but looked it up on line, the diagram of the F85 on the manual looks different than mine. It has three (HIGH, LOW speed screw, and LA (Idle speed screw). How do I adjust the right setting on mine?