Re: Sometimes it starts, sometimes it doesn't
On a car, I'd opt for a sticking starter motor. But I'm not sure how different a bike starter is to a car starter.
When you get a feel for knowing if it'll start or not, connect the battery direct to the starter to see if it'll start that way.
If the fuel pump primes, it's not any of the "idiot" switches (kill/clutch/sidestand). Possibly a dodgy connection somewhere, but I doubt it'll be HT leads & plugs (although worth a check).
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