Hello, I have a Speedfighr 4 50cc AC 2T with injection. Some time ago my scooter got in contact, it went out in the stand gas suddenly and started only very difficult. Now it does not start at all. I first checked the air supply and it does not seem to be disabled. Next I looked at the spark plug and this was very bad. After I changed you the engine worked at least about. If I start it and give it full throttle the engine turns The petrol and oil pump works perfectly. Can the whole thing lie on the injection valve? Or what else could it lie on? Thank you for all the help!