I leaned it in and my tack read 13,600 today when I was out flying. I pinched the fuel line and it actually didn't want to rev much higher (just a tad) before it wanted to die out then. So I backed the high end back down a bit so it wasen't running to lean. Nothing was clogged in the needle area...I blew it out and my fuel filter was also clean. Before it would cackle at a lower speed (about 1/3 throttle) but then it started to cackle at lower and higher speeds.