when i ran mine in i made sure it was rich mixture then as it started to loosen up slowly started to lean it out on the top end screw .maybe use a little extra oil make it mineral based so the rings will seat ,then when its getting to peak revs change to synthetic oil ,keep the car moving so there is good airflow around the engine or it will overheat ,be patient ,it will take about 3 hours of running remember DIRT inside the air cleaner will KILL your engine along with too much HEAT my baha is going very well have FUN