if you lean it any, and it quits, then you may be running it too lean as it is. What you want to do is get it to max RPM (using a tach), and then richen it two or three clicks so that it slows down about 300 RPM. After the engine gets broke in good, you should be able to lean it out some (after a couple of gallons of fuel have been ran through it), but you will never get rid of all of that spray--it comes with the territory!