4 turns are actually a lot, normally, if you need 4 turns for your motorcycle to go fine, a bigger pilot jet is usually recommended, but somehow, I just think the previous owner fiddled around with it too much!
Are you sure your pilot jet is not clogged (unless it was that you were referring to)? The pilot jet can usually cause a lot of trouble, as it easily becomes clogged, and if this was the case, then I am sure that, with the 4 turns, were the reasons your problems!
The way to actually get the best fuel mixture screw settings, is to set it at the normal starting point (1 3/4 turns). Then see how well the motorcycle responds by playing it around with the throttle. If it doesn't respond well, then try richen that screw for an other 1/4 turn. If it runs worse, then you know it's too rich, so go leaner! Continue doing this until the best response is achieved!
There should be an other way to test it, but have not tried it myself. Should include to turn the pilot screw in as much, till the idle gets rough, then turn it out till the idle gets rough again, and set the screw to something in-between.
I hope this helped!
/Mollrik
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