When you turn the key on all lights come on? Brake light works and horn?
If so, thumb the starter button. Not even a click? Holding the clutch in and the keeping the starter button pressed, sweep the steering lock-to-lock. Starter engages suddenly? This will be the two weak "bullet connectors" along the forward, left side of the frame needing attention (clean, crimp, Caig DeOxit or Vaseline, heat shrink, and groom them into place where the steering will not tug them open).