I'm not quite sure I understand your English. However these bikes' fuel supply operate on vacuum and if I understand correctly you're not getting fuel to the engine. Check firstly that the vacuum pipe connected to the fuel supply valve is working correctly. 3 pipes: 1 Main fuel supply. 2 Reserve fuel supply. 3 Vacuum.
Sucking on 3 will result in fuel pouring from 1 or 2 depending on where the valve is set.(Reserve or main). If not the valve is faulty.
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