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Feb 27, 2025 at 9:37 PM in reply to: Miss and backfire under 5k only after engine warms up – 2009 GT650R #18999
Mark de RooyParticipantSorry I just got in touch with the last owner. The stator was replaced at the same time as rectifier . It is electrosport brand from America.
Feb 27, 2025 at 9:22 PM in reply to: Miss and backfire under 5k only after engine warms up – 2009 GT650R #18998
Mark de RooyParticipant
I have a battery monitor on the bike. When I rev it, it will reach 13.7. Do you think that it isn’t charging right? The bloke I got the bike off said he fitted a new rectifier but not the stator. He also gave me a bag of spares. It includes a new stator and rectifier as the one you are showing me.Feb 27, 2025 at 2:29 AM in reply to: Miss and backfire under 5k only after engine warms up – 2009 GT650R #18989
Mark de RooyParticipantCoil test. Front Primary 4.7 Secondary 14.98 cap 7.52. I can’t pull the cable out of the coil, I’m not sure if it will break? Rear Primary 4.8 Secondary 13.67 Cap 4.88. Pickup coil 210, supposed to be 110-140. Stator it goes down to .1 the 0 on all? I can’t start it at the moment, it was ok then starter solenoid started clicking. Battery is is floating on 13.03.
Feb 26, 2025 at 8:18 AM in reply to: Miss and backfire under 5k only after engine warms up – 2009 GT650R #18983
Mark de RooyParticipantThe starting I know is a separate issue. I tested my coils , lead and caps Front lead plus cap : 22.50. Cap is 7.52. Rear: 18.55. Cap is 4.88. Will this cause the rough idle and misfire down low?
Feb 26, 2025 at 3:52 AM in reply to: Miss and backfire under 5k only after engine warms up – 2009 GT650R #18982
Mark de RooyParticipantSorry back again, now I took the bike out for the first proper ride yesterday . It was going pretty good. Then after 10 mins it started to spit and fart under 2,500 revs. I checked anything to do with the coils, seemed ok. This morning the same when it was cold. After stopping and starting maybe 5-6 times, it started clicking from I think the solenoid near the battery. Battery is full.
Feb 20, 2025 at 4:13 AM in reply to: Miss and backfire under 5k only after engine warms up – 2009 GT650R #18953
Mark de RooyParticipantHi all, just reporting in to let you know the bike is fixed it was an injector. Thanks for your patience and help along the way.😁
Feb 17, 2025 at 12:08 AM in reply to: Miss and backfire under 5k only after engine warms up – 2009 GT650R #18931
Mark de RooyParticipantWe seem to have spark but it still runs the same with the front leed off.
Feb 16, 2025 at 12:26 PM in reply to: Miss and backfire under 5k only after engine warms up – 2009 GT650R #18924
Mark de RooyParticipantThanks Marcel, some homework for tomorrow.
Feb 16, 2025 at 9:08 AM in reply to: Miss and backfire under 5k only after engine warms up – 2009 GT650R #18921
Mark de RooyParticipantI haven’t gotten to that yet. What I have found today. When I spray the rear cylinder with water, I get steam like it should when it is at running temperature. The front cylinder I get nothing. So it’s not firing. I’ve changed the coils, leads, caps and plugs. What next?
Feb 15, 2025 at 3:21 AM in reply to: Miss and backfire under 5k only after engine warms up – 2009 GT650R #18913
Mark de RooyParticipantOk peeps, I took her out this morning. It has no power and using a lot of fuel. Engine is running smooth, no backfiring. Plus will stall under 2k revs.
Feb 7, 2025 at 10:39 PM in reply to: Miss and backfire under 5k only after engine warms up – 2009 GT650R #18863
Mark de RooyParticipantThanks Marcel, I’ve already sprayed all or the plugs. Is this something the isc solenoid can do?
Feb 7, 2025 at 1:03 PM in reply to: Miss and backfire under 5k only after engine warms up – 2009 GT650R #18841
Mark de RooyParticipantSo I had the ecu out and reconnected it. Now it seems like it’s running good from 2k up. I’m thinking something up with that connection. It won’t idle though. Anything below 2k, it coughs and dies. Tomorrow I will check the isc solenoid and tps.
Feb 6, 2025 at 5:57 PM in reply to: Miss and backfire under 5k only after engine warms up – 2009 GT650R #18832
Mark de RooyParticipantI took it out again and it seems like it is running almost perfectly above 5k revs. Is this something the ECU can do or ignition timing?
Feb 6, 2025 at 5:51 PM in reply to: Miss and backfire under 5k only after engine warms up – 2009 GT650R #18831
Mark de RooyParticipantYes I replaced it.
Feb 6, 2025 at 5:42 AM in reply to: Miss and backfire under 5k only after engine warms up – 2009 GT650R #18828
Mark de RooyParticipantOk I haven’t had a chance to go for a ride until yesterday. It still backfires and misses and stalls. It seems mainly under 5 k revs. So I’ve checked all connections and replaced the coils, leads, caps and plugs and injectors. I’m thinking maybe the ecu is stuffed?
Jan 17, 2025 at 10:56 AM in reply to: Miss and backfire under 5k only after engine warms up – 2009 GT650R #18559
Mark de RooyParticipantOk thanks again mate.
Jan 17, 2025 at 10:24 AM in reply to: Miss and backfire under 5k only after engine warms up – 2009 GT650R #18557
Mark de RooyParticipantOk thanks Simon. I thought it was something breaking down. I hope it is just a plug. What plug would you recommend?
Mark de RooyParticipant

Mark de RooyParticipantOk thank you, I will do that. Would you have a link to where I could buy the ones you recommend?
Mark de RooyParticipantI’ve tested the plug caps as well. Front 4.7 ohms and back is 6.2 ohms. I thought I should test them again. I don’t know if the reading coming from the spark plug lead should flash then go out?
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