Put the float bowl overflow pipe (it comes off the bottom of the carb) into a bottle (wine bottles are about the right height), then carefully undo the float bowl drain screw, with the fuel tap in RES position. Fuel should flow freely into the bottle. If it does, screw the drain back up, fuel is getting to the carb. If not, your fuel tap is blocked or your float bowl needle valve is not opening. If it's getting in there, but the bike still doesn't run, you may have blocked jets. Remove the carb, (drain the float bowl first by repeating the process above but with the fuel tap OFF) and remove the four screws that hold the float bowl on. Carefully remove the bowl, then you'll see the main jet and another smaller one next to it. Remove these one at time, check you can see light through them. If you cannot, you have a blocked jet and need to clear it. Best not to poke anything in there, but instead use carb cleaner. Once both are clear, you should be assured of getting fuel into the motor, at least well enough for it to run. There are probably more complex issues that could cause a non-start, but cover these basics first.
ETA: petrol will go everywhere doing this - don't smoke or throw lighted matches at the bike while you do this..
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