Thanx. That all makes sense. Only my second gasser. First one I sold after I realized it wasn't big enough for my Cap. 40cc. Wanted a little more oomph. Manual says not to do these adjustments while engine is running? If I have another person that's not an issue right? I can turn the screws a tad at a time while it's running? Also.. Manual says it should get 6700-7200 rpm. So what should I be shooting for? 6700 or 7200!? Then backing off 100-200. Thanx.