Hi, I also had a problem with my Roketa Bali 250. It would cut off at full throttle. A scooter freak friend of mine replaced with fuel injection hose 6 inches of fuel line that went from the tank to a diaphragm under the seat. He also replaced some of the vacuum hoses. something about them being to flimsy he said they collapsed on themselves as pressure increases. As you know, the Chinese use the cheapest material available and i guess they don't believe in quality control. Anyway be patient go through all the vacuum line one by one the slightest kink in any of them will make your scooter not run properly. also I don't let my fuel go below half a tank. This seams to have solved my problem. Hope it can help someone else. good luck.