Simon
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It sounds a bit strange it could be the starter clutch or the key has sheared need to remove the stator cover for further investigation
Recharge battery will light up the dash just don’t start it, it could damage things but most likely will have blown a fuse
Your regulator and most likely the stator has gone it is fuel injection I assume? It will run until the battery level drops then it’s no go.
The standard NGK but beware there are a lot of fakes out there,reputable traders only
It’s always worth checking the gap, only happening when it’s warm says something is breaking down even if you fitted new plugs it could be a duff one, also I’m very wary of iridium plugs there can be more trouble than they are worth
It will almost certainly be the side stand switch just unplug & bridge the connection on the loom side with a piece of wire just to confirm
Was there any problems before it went away? I really hate to say but a week to carry out a service & rebuild some carbs (a day at most with tea etc) then it doesn’t start sets all sorts of alarm bells ringing
Get a multimeter & tbh most checks are dead simple there’s most likely a manual on this site for the bike but most coils etc are a pretty standard resistance, check all the connectors you can find & by that unplug clean with contact cleaner spray cheap & easy to do, the fact the bike went for a test ride etc & was ok says it’s most likely something really simple.
It’s very difficult to diagnose over writing & not seeing the bike or knowing the ability of the owner regarding mechanical knowledge (I don’t mean this in any derogatory terms)
If there’s no code it’s doubtful that it’s an injector, o2 sensor etc but a bad coil or sparkplug will not show up, the ECU is simply not that sophisticated the injectors don’t do anything when the ignition is switched on they only function when it starts.
Doubtful that it would just be the gap, it is almost 99.9% going to be a bad connection or a failed electrical component
With fuel injection if the voltage gets low the ECU will try to keep the main things running as long as it can which is why it will start to mess about, the fact the bike ran fine for a bit sounded like the battery was discharging so to me the first thing to check. Now it’s going to be a bit of detective work, it could be something as simple as a loose or damaged plug cap or coil or a sparkplug so that’s the next things to look at.
Turned off the battery wants to be 12.5 or so switched on no less than 11.9 with pump priming running ideally 14-14.5
