it is easy - i followed the manual- run at 1/4 throttle for 4 tanks on the ground in a big circle giving it short bursts to clean it out . then for 3 tanks run it at 1/2 throttle on the ground w/ short bursts. after that just run it and start leaning it out for performance. it works on all my motors and it makes sense. also run it on a flat surface so it dont stress the motor and heat it up to 200deg F. before you start it. this is what works for me but- people will tell you many other methods.