Bike won't start without bump / push start ????

[rev 01]

Maj is correct, that switch serves two important functions.

With the clutch in & switch made, the max rev limit is further reduced from the normal limit of around 10,600 or there abouts to something like 10200. This helps to slow & protect the engine from over rev damage should you miss a gear with wide open throttle & clutch lever in. I think they call it the first limiter.

By passing the switch by connecting the two wires together activates the first limiter. <i></i>