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SimonParticipantYou could have lost a phase but if it’s not charging it’s going to be the rectifier
SimonParticipantThe readings on the stator should be low eg 0.54,0.48,0.49 something like that so you may be lucky & it’s just the rectifier that’s gone
SimonParticipantCan you turn the engine by hand
SimonParticipantIt sounds a bit strange it could be the starter clutch or the key has sheared need to remove the stator cover for further investigation
SimonParticipantEven if the ECU is stuffed lights should come on
SimonParticipantCheck all of them should be a box around the battery area
SimonParticipantFuses check them no lights etc normally main fuse blown
SimonParticipantRecharge battery will light up the dash just don’t start it, it could damage things but most likely will have blown a fuse
SimonParticipantYour 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.
Jan 17, 2025 at 10:44 AM in reply to: Miss and backfire under 5k only after engine warms up – 2009 GT650R #18558
SimonParticipantThe standard NGK but beware there are a lot of fakes out there,reputable traders only
Jan 17, 2025 at 8:37 AM in reply to: Miss and backfire under 5k only after engine warms up – 2009 GT650R #18556
SimonParticipantIt’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
SimonParticipantHappy new year all
SimonParticipantIt 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
SimonParticipantWas 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
SimonParticipantCould well be the fuel pump relay
SimonParticipantC means no fault,
SimonParticipantGet 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)
SimonParticipantIf 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.
SimonParticipantDoubtful that it would just be the gap, it is almost 99.9% going to be a bad connection or a failed electrical component
SimonParticipantWith 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.
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