Hello guys. I’m here really at etching I’ve built in new cylinder head and the scooter does not jump to control times and valves are 100% set, if I now install my old cylinder head the scooter jumps immediately on, I’ve changed the new cylinder head once because of material error there was the thread of the spark plug hole not ok, so I had built the old cylinder head back on it and it jumped immediately on after a few kicks, now the ne ue cylinder head in it and the scooter doesn’t even pretend to want to walk. Ignition sparks is clear because fuel gets it also air filter is new Vergasser is lightning blank clean all sloppy are new. I don’t understand why it doesn’t even come to a ignition