Hello -- Today my saw started acting funny, and now it won't start. The saw is an old McCulloch Eager Beaver 2.0 (model 130Y). I had recently got it working again after it sat for a long time. I cut about five trees when the saw started to idle really fast, i.e. the chain would spin at idle. So I figured I'd adjust the carburetor. I adjusted the screws a little until I thought it ran better and the idle was down. Then after a little while the saw stopped running altogether. I can get it to kick over for about 10 secs but it won't stay running and feels pretty rough. Since I am an experienced auto mechanic I just picked up this Exxon two-stroke oil at the local parts store. That is what I have been using in the tank at a 50:1 ratio with 89 octane gas. THe engine just feels to me like it is not getting gas really well but I've got no idea. I tried, by the way, adjusting the mixture with instructions at this URL: http://www.madsens1.com/sawtune.htm . There are three screws on this saw: idle, hi and low. Please help me fix my Mac saw ... I just bought a new bar and chain. Thanks.