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What was the cause ?

If it is like that the wire + from battery goes into the inside of the relay and corrodes there might be a sign of blue powder around the + terminal,that wire connects to one side of the 30amp...

Check the Starter relay
is it like this http://www.te-motorcyclespares.co.uk/product.asp?productID=13418
its similar to the one on my bike and they rot inside as i found out !causes all sorts of...

You havent acidently knocked the kill switch (done it myself) cause some bikes the engine will turn over but not fire up!