break it in by just running it rich with a sock or sumthing on the head to get the temps up around 220 or so. i usually run 5-6 tanks through and then just race tune it. you want to set the HSN first like R2k said, but set the idle to that gap that is shown in the manual, u can eye ball it to where it looks close to what the manual shows, from here on out u shouldnt touch the idle screw. The idle is set with the LSN. If the idle is way to low lean the LSN too high Richen the LSN tune for good smoke throughout the entire power band tempos of 260-280 are ok with good smoke and a good crisp sound