Like everyone else says,jetting is a big part of getting it to run right.Mine was off one clip on the needle and it was running crappy,as soon as i moved that clip one notch,i about shit my pants when the power kicked in,it was like a new engine.It does get nerveracking to have to go through 10 different sizes of jets to get it to run right,but it will be worth it.I know we have different carbs,but when i put my Rockets on,i went to the top notch on the needle,and thats when it really came to life.