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I'm starting to feel a bit more confident with my repair on this saw. Thanks.

Is it true that you can't and shouldn't adjust the low and high screws without a tachometer? I got it so that it seems to run properly but I just did it by ear. Any pointers would be appreciated.

Thanks for all the help. I'm obviously no mechanic either but I'm trying to learn. This saw is not mine but a friends so I don't know the history or what kind of oil they have used. I was wondering if he ran it with straight gas. In pretty sure he has motor oil in the bar oil tank. I played...

Perfect. End of thread I guess. ;-) Any ideas on why this saw runs like crap and smokes like a champ? It's an almost new MS250. I put a new carb in it thinking that might be it. No difference. It's got the right mix of fuel, clean air filter and new fuel filter and new spark plug.

I don't know if you can tell from the pic but is the brownish tint to this piston normal?