I have an old Poulan 2800 that is a great saw when it runs, but has had idle problems for a couple years, with very light use. I noticed a while back the cylinder was a little bit loose and rattling, so I suspect that's the reason I can't get the carb tweaked to idle worth a hoot--the compression varies when the cylinder moves around? Tonight I finally got the 4 cylinder bolts to loosen up, and removed the cylinder. There is a small tear in the gasket, but otherwise seems to be in good shape. Do I need to put a new gasket on? I've seen people mention a silicon sealant, is that better? I'm not sure why the cylinder is loose. I'm thinking either the bolts loosened up and started backing out, or a shop I took it to a while back put in too long a bolt set, and they are bottoming out. Not sure what I'll run into when I try and put them back in. I'm a complete newbie to engine work. I've dropped some gunk in the crankshaft, and it's already got a little crud in there. How should I clean it out? Finally, once I get it all cleaned up and the cylinder installed properly, what is the procedure to "reset" the carb settings, so to speak? It's all goofed up, now that I've tried to adjust out the idle problems. As mentioned above, I'm a newbie to small engine work, and any help would be appreciated!