Could be a Stator or Pick-Up coil problem. (also known as Ignitor) This is attached to the Stator and can usually be replaced ... but you could also have a bad Stator (expensive)
Your manual may show testing procedures for both Stator and Pick Up coil ... but these tests do not always prove the problem decisively. Best to replace with KNOWN TO BE GOOD units.
Other issues could be:
A lose wire or connection?
One of the safety cut outs is blocking ignition:
Side Stand safety switch
Clutch switch
Neutral safety switch
key ignition unit and connections (wiggle wires under dash around switch)
fuse issue
Bad plug wire or connection
Good luck!
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