So my bike (2015 650) won't start easily. The engine turns over when i press the ignition button. Excuse my lack of knowledge of technical terms, but when I turn the key and the dash lights up, I then turn the kill switch to on, and there's usually a slight whirring sound after I turn the kill switch on. Whenever this sound happens, the bike starts just fine. But sometimes when I turn the key and press the kill switch to on, there's no whirring sound and the bike turns over but wont start. If you have experienced this or you know what the problem, I'd really appreciate it before I go around replacing spark plugs and batteries and what not. I did charge the battery and it started quickly afterwards so I think the battery might be fine. not sure about spark plugs, havent checked them (dont know how to). Is there anything else that could cause ignition problems?
Why on earth are you using the kill switch, FYI every time a contact is open, it is exposed to air / oxidation.
I am going to suggest something which very few know , even electricians. A common problem with new technology is many devices use milli or micro amp for electrical interlocking, when I say a problem, you need roughly 1 or more amps to blow away oxide.
I am going to suggest that once you have the bike started, very gradually move the kill switch to off, what I am trying to accomplish is create a arc, so ideally, the contact just barley opening. You may need to repeat this several times. Next close your kill switch and only use it for emergencies . Normal key on process the ECU is checking sensors, gear selector / kick stand / fuel pressure. Having the kill switch open indicates a fault, closing it even 3 seconds after keying on you are asking the ECU to do another scan, does this make sense ? Remember the kill switch
interrupts the stick coils, fuel pump, it is meant as a emergency shut
down same as the tip over switch.
Report back, being a 2015 I can't see a key switch problem but it can happen. If so one of us can guide you for testing, which requires a digital volt meter. FYI, several methods of quick shut down are possible, the one I use when I get home is to put the kick stand down while in first gear, my driveway is sloped and the instant the kickstand is down the motor stops, I then take my gloves off and key off,two things just happen, #1 I have proved my stand and switch are working properly, on the 2015 I notice the stand spring is much weaker than the 07 Versys, not always does the stand retract fully. #2 with the stand down and clutch out, my bike doesn't roll backward. When I get off and have all my gear off, I put it in neutral and push it into the garage.
Hope this helps.