well i received me Roketa MC-54 250 and so far many probs. first it started over heating... my solution to that was that a hose fell off a nipple on the carb. bingo fixed my overheating issue. Next was the "running out of gas shenanigans." which it wasn't getting any fuel but had plenty in the tank. i think its a vacuum issue, so i replaced the cheap vacuum lines that came with it with some nice ones, but still same prob it will run about 1/2 mile then die. However i did take off the hose that was connected to the front and back of the carb and plugged the front and just left the back hole open. and it fired right up!!! amazing so anyway i havent tested it. and i dont know if theres going to be fuel coming out of the carb overflow. i would like to get it to run the right way.. i would really like to know why i cant get fuel to the carb using vacuum? any feedback? thanks in advance