byrons 30% is what i used on mine (4th P5 ive broke in) heat it up to 200deg and then start it up mine all started right out of the box let it idle for a 1/4 tank and then put it on the ground and start making circles on flat pavement using only 1/4 throttle, then the next tank the same but a little leaner on top keeping it around 220deg. i run 3 tanks let it cool down then 3 more after you reheat it, (when its cooling down make sure piston is at the bottom) after 4or 5 taNks start giving it 1/2 throttle bleeps to clean it out. after 10 tanks do full throttle bleeps for a SHORT time and get a 1/2 gal in it before you head to the track....