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If it runs fine upright but not on side could mean a number of things. Fuel line/pick up is most common, but crank seal with leak is very common to. If it changes tone, Rpm very much or even stop when on side it is 99% of the times seal leak. It is the seal closest to ground. If you tilt saw...

There is pretty much room for adjusting on a normal carb, but these EPA things with hair thin needle tip's doesn't care if it is 2 or 5 turns out as the seat will only let by a certain amount. Once open it will not get more open. There is a easy way to test what system is giving problems. Put...

If it is touchy or tricky to tune there might be a problem else were, there is often a reason they run lean, not just operators choice...