Good day to everyone! I bought a SMC Quad Rex 50cc cheaply. But unfortunately it just doesn’t want to start. I’m new in this forum, so please tell me if anything is missing or so. SMC Quad Rex 50cc – blue spark that appears at regular intervals – spark plug is moist in my opinion, carburetor cleaned several times – does not start with brake cleaner as starting aid – E- start runs, as I also operate it on an external battery at the moment – Membrane is in my opinion ok, no light shines through – intake nozzles and similar have no cracks – fresh petrol and oil in it – Polrad sits on the foreseen wedge and Pick Up is firm Have tried to start very often, but it just doesn’t want to. Also, the whole engine makes a loud crack noise, but only sometimes. Have taken off the Variomatic cover once, and every time the clack noise comes the engine turns backwards I think (see in the attached I was thinking as a complete layman, if it could be that the ignition time is perhaps wrong, because the piston sometimes burns backwards while clapping, so too early (No idea if this is possible)? I just attached the pole wheel as a picture.. I hope someone can maybe do something with this???