first thing i would do is put your carb setting back to the default settings, and turn the high speed in 1/8 and turn the low speed in 1/16, because the engine is broke in already. the setting are, high speed 2 and 1/2 out from fully closed, and the low speed is flush with the brass nut and then turn in a half turn. do this and if it still won't idle then more than likely your motor is wore out. don't fret. you have a 2 year warranty on the engine, go to hobby services online and it will tell u the rest. the reason your motor is doing this is because the sleeve is wore out, and when the engine get warm it loses compression and won't run or prime fuel for that matter. if u wait about 30 minutes it cranks up is a good sign of sleeve wear. the best thing u can do is send it in get it fixed for free, and when u get it back if u don't have one get a temp gauge and don't let the engine get above 250 degrees. i wore my first engine out the same way i had it set more to racing setting and burned it up at about 3/4 of a gallon, but it ran great though. that is the proper carb setting according to O.S. engines, not duratrax, and i trust them much better than duratrax. also don't mess with the low speed needle much, if u break it in and it runs great and has good take off, leave the low speed ALONE!!!!!! and u should be fine. good luck.