well its already done with break in, but what i did was okay and wont hurt it? when it came out of the box it was so rich that it couldnt even engage the clutch at 3/4 throttle and was running very cold so i did lean it out before the end of break in, but i just went slow and dindnt hold it on power for any more than 4 seconds so i think it was broken in well. it was rich, about 190-200 degrees, 4 second gentle acceleration. how does that sound to you guys? do you think it will last long?