My brother has a petrol scooter, 50cc two-banger. Its a chepy from asia, and has been sitting in the garage for nine months. We took it to a shop who got it running, but I've got no clue about these engines. We replaced the plug, cleaned the air filter, checked the feul tap and feul lines, and seems ok. It initially started OK, ran for about 40 mins, and then turned it off. We tried to start it only 5 mins later, and no luck. To get it started again we primed it, used choke and had to put some feul on the tip of the plug. It started up fine with the feul on the plug, and ran for about 5 minutes on choke, 5 minutes off. We gave it some throttle and was OK. The engine then cut out suddenly, and we couldnt get it started.... Now were back to square1, and even feul on the plug wont start it. Keeping in mind that we have good spark, and it is pull star only. The feul mixture is right, and the feul is clean. Please help me, cos its too crap to spend any money on. PS. I hate pocket bikes and piss-ant toy scooters, but at leat he's on 2 wheels.