do you have a new moki brand engine, if not your in the dark on proper run in for them. moki owners understand about the run in time. you can fly before that much but i don't. a little fuel money makes me feel better than risking a 1500$ and up plane. fuel is cheap compared to a plane really after i get it built take my sweet time i hate building arf's. every engine i buy i run at least a half gallon in them most a gallon. i have had 1 dead stick in two years Barron checked the fuel it was a bad gallon i must be doing something right. new plug after fuel jug changes i have a different jug for each engine so i know how much time is on my engines. i may be a kid but i know how to make a engine run right and plane fly right