Issue E.C.U hyosung gv 125cc – GV125-S EFi
- This topic has 40 replies, 2 voices, and was last updated 1 year, 6 months ago by
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Can you elaborate on what it is actually doing from the moment you turn it on ? and how much of a mood is it in while riding before it gives up ? So i can point out what the issues might be. Even information on how it idles on stand still ?
What colour are the spark plugs ? are the CR8E or some other code name etc..
Did the coils change? (rear one fails commonly, so do a swap test)
Does it have black HT caps ? (get rid of them and use NGK ones!) – Nothing but trouble those thingsYour ECU is discontinued, it’s the early type (circa 2017-2018) , before they all changed to the updated delphi units including all wiring harnesses changed (not backwards compatible) and most sensors changed. The fact that it runs (even starts the bike) means not all hope is lost on that unit. So i would address it as last item to worry about
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Hey sorry for it I take a walk last night
I went back to patrol shop with electrical cleaning the bike started now but work weird
So then the bike has lost a lot of power in the last few months,
plus it turns off when driving sometimes
so I took as much info from the website
such as cleaning the TPS sensors and the air sensor , caps injection coils ecc ecc
So problem stil there still not sure about the ECU 😬
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Video sounds good. I hate to say it , Historically Hyosungs since 2000 have always hated pod filter setups , so maybe start by putting the original airbox back and original filter?
Also if there is too many changes to the air system = ECU will not adjust completely as Hyosung themselves set the ECU to expect to run efficiently on its OEM parts including the injectors (i am currently studying upgrade options to the injectors so that they output a little more fuel to stop the bike leaning out on full throttle)
I would also advise doing compression tests after the engine is warm with both spark plugs out. You said it was getting worse , we don’t know if your compression is getting lower (due to bike leaning out & running hotter from that air system change , thus piston ring woes likely) . Maybe on rainy days , some wet air was sucked in to the engine over time (it looks exposed)
Just some thoughts here , keep us postedon that video situation
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Admin Edit….
Videos Uploaded to Vimeo (free site) allows Apple videos to be playable on Android phones.
https://vimeo.com/1043732101?ts=0&share=copy
https://vimeo.com/1043732300?ts=0&share=copy
https://vimeo.com/1043732259?ts=0&share=copy
https://vimeo.com/1043732198?ts=0&share=copy
https://vimeo.com/1043732132?ts=0&share=copy
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You can upload videos to Google Drive, OneDrive , or iCloud i believe = Then get “share links” to post them here for public viewing.
I will upload your old videos to Youtube (as unlisted so they won’t be found on youtube search) so it’s easier to play it. (not all android devices canplay “apple” files , so its easier uploading to the cloud drives and they will convert them for public play. Sorry for digressing
I still need to know what’s going on with the situation of restoring the original airbox system back on the bike?
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-
-
You have either:
– Wiring issues (not enough juice flowing on the wires going the sensors mentioned in the tester thing you have) , new harness or remove it complete and clean every part of it with contact cleaner – do the same for the sensors connected to it.
You should have less errors. The ECU is annoyed hence it will keep cutting offAnd make sure even the battery is properly charged & the regulator is doing “Minimum” 14v to it (no less) (even if it’s idling)
Fuse boxes may be rusty too. Including relays.
Or
the parts themselves mentioned have issues / faulty (temperamental behavior). Ie, faulty coil means it works then it dies.
Or
ECU itself has gone faulty , I hope it doesn’t come to that!
-
-
-
That’s no good, too much rust = easy voltage drop (even a little) , we’ve been there. (or even a sensor somewhere else , having its resistance affected (ohms too low or too high on the wire, the ECU will trip)
Go under the bike and find your regulator rectifier, get pictures of it and also the connectors on your harness.
You have a long job but i am sure it will be worth it, you want “nothing electrical” to have rust , even down to the red battery wires etc.
Hyosung tried but remember UK rains too much!
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Looks aftermarket , interesting! – It should be bigger and all black but for some reason the bolts are both there, so it could be an earlier type before Hyosung updated it (Yes, they are known to fail since 2001!)
Follow the plugs and check the connectors.
Also measure the bolt holes apart ie…. (0)_____40cm____(0)
I might do some upgrade version that makes sure it stays “14.5v” constant (no flactuations or droping to 13.5v) , although earlier carb models lived on 13.5V as they had way less electronics , but because you have fuel injection model with a lot of sensors , best to ensure it is 14.v in any revs
If it ever spikes above 14.8v while running = don’t ride it. That would be battery or regulator or stator on the way out (both worth together, so ie. a bad reg slowly kills the stator unit inside the flywheel crank)
Good luck though, it seems as though with the snow all over UK, put her indoors & work on it slowly.
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I cleaned almost all contact still weird but beat better
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Thanks for the info, ill make a new mod regulator upgrade soon , already got the terminals , send us an email if you want to try (&you being a test rider)
Video uploaded to vimeo (upload there if you can or Google Drive / OneDrive /DropBox other video upload service because we can’t play Apple videos on certain older android devices)
I saw the video, it looks like its slow to rev up as it may be too cold. Now after 5-10 minutes hot, are both cylinders hot ? and is it riding better?
keep the original airbox & don’t fit the aftermarket one , it looks like its idling under 2,000 rpm (which is the default) , that’s a good sign.
Next step.
idling = what is the voltage ?
At 5,000 rpm = what is the voltage ?
At 8,000 rpm = what is the voltage ?Regulator test, so i need all 3 figures above ^ before i comment further.
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Hi Marcel, sorry if I haven’t responded these days, I’ve been very busy …..I checked the voltage these days and it seems stable the bike remains between 1,500/1,700 rpm, voltage 14-13.9 5,000 14.3v 8,000 14.4/14.6v however in the end the problem was the fuel pump relay which since I changed it the bike no longer turns off…..
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Ok no problem I have received ur email Just I will proceed with payment this Thursday if ok
Hello,
No problem, reply to that email we send you. If you have some other ideas to improve your ride, send me an email and i will check if that is possible so we keep her lasting longer.
Lets try it 👍 -
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Hi mate sorry I have problems with email I tray to send an email to you Just wondering how do we’re proceeding for the item ?? Also I was wondering about few orders I put last week still waiting for news
What errors do you get ?
message me here temporarily until your email is fixed:
https://www.facebook.com/people/BrewMoto/61555775510442/Orders were shipped today (I was waiting for EBC to make new brake performance pads)
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- You cannot reply to this topic.
- This topic has 40 replies, 2 voices, and was last updated 1 year, 6 months ago by .
-
Posts
-
-
-
-
Can you elaborate on what it is actually doing from the moment you turn it on ? and how much of a mood is it in while riding before it gives up ? So i can point out what the issues might be. Even information on how it idles on stand still ?
What colour are the spark plugs ? are the CR8E or some other code name etc..
Did the coils change? (rear one fails commonly, so do a swap test)
Does it have black HT caps ? (get rid of them and use NGK ones!) – Nothing but trouble those thingsYour ECU is discontinued, it’s the early type (circa 2017-2018) , before they all changed to the updated delphi units including all wiring harnesses changed (not backwards compatible) and most sensors changed. The fact that it runs (even starts the bike) means not all hope is lost on that unit. So i would address it as last item to worry about
-
Hey sorry for it I take a walk last night
I went back to patrol shop with electrical cleaning the bike started now but work weird
So then the bike has lost a lot of power in the last few months,
plus it turns off when driving sometimes
so I took as much info from the website
such as cleaning the TPS sensors and the air sensor , caps injection coils ecc ecc
So problem stil there still not sure about the ECU 😬 -
-
-
Video sounds good. I hate to say it , Historically Hyosungs since 2000 have always hated pod filter setups , so maybe start by putting the original airbox back and original filter?
Also if there is too many changes to the air system = ECU will not adjust completely as Hyosung themselves set the ECU to expect to run efficiently on its OEM parts including the injectors (i am currently studying upgrade options to the injectors so that they output a little more fuel to stop the bike leaning out on full throttle)
I would also advise doing compression tests after the engine is warm with both spark plugs out. You said it was getting worse , we don’t know if your compression is getting lower (due to bike leaning out & running hotter from that air system change , thus piston ring woes likely) . Maybe on rainy days , some wet air was sucked in to the engine over time (it looks exposed)
Just some thoughts here , keep us postedon that video situation
-
-
-
-
-
-
Admin Edit….
Videos Uploaded to Vimeo (free site) allows Apple videos to be playable on Android phones.
https://vimeo.com/1043732101?ts=0&share=copy
https://vimeo.com/1043732300?ts=0&share=copy
https://vimeo.com/1043732259?ts=0&share=copy
https://vimeo.com/1043732198?ts=0&share=copy
https://vimeo.com/1043732132?ts=0&share=copy
-
You can upload videos to Google Drive, OneDrive , or iCloud i believe = Then get “share links” to post them here for public viewing.
I will upload your old videos to Youtube (as unlisted so they won’t be found on youtube search) so it’s easier to play it. (not all android devices canplay “apple” files , so its easier uploading to the cloud drives and they will convert them for public play. Sorry for digressing
I still need to know what’s going on with the situation of restoring the original airbox system back on the bike?
-
-
-
-
-
You have either:
– Wiring issues (not enough juice flowing on the wires going the sensors mentioned in the tester thing you have) , new harness or remove it complete and clean every part of it with contact cleaner – do the same for the sensors connected to it.
You should have less errors. The ECU is annoyed hence it will keep cutting offAnd make sure even the battery is properly charged & the regulator is doing “Minimum” 14v to it (no less) (even if it’s idling)
Fuse boxes may be rusty too. Including relays.
Or
the parts themselves mentioned have issues / faulty (temperamental behavior). Ie, faulty coil means it works then it dies.
Or
ECU itself has gone faulty , I hope it doesn’t come to that!
-
-
-
That’s no good, too much rust = easy voltage drop (even a little) , we’ve been there. (or even a sensor somewhere else , having its resistance affected (ohms too low or too high on the wire, the ECU will trip)
Go under the bike and find your regulator rectifier, get pictures of it and also the connectors on your harness.
You have a long job but i am sure it will be worth it, you want “nothing electrical” to have rust , even down to the red battery wires etc.
Hyosung tried but remember UK rains too much!
-
-
-
Looks aftermarket , interesting! – It should be bigger and all black but for some reason the bolts are both there, so it could be an earlier type before Hyosung updated it (Yes, they are known to fail since 2001!)
Follow the plugs and check the connectors.
Also measure the bolt holes apart ie…. (0)_____40cm____(0)
I might do some upgrade version that makes sure it stays “14.5v” constant (no flactuations or droping to 13.5v) , although earlier carb models lived on 13.5V as they had way less electronics , but because you have fuel injection model with a lot of sensors , best to ensure it is 14.v in any revs
If it ever spikes above 14.8v while running = don’t ride it. That would be battery or regulator or stator on the way out (both worth together, so ie. a bad reg slowly kills the stator unit inside the flywheel crank)
Good luck though, it seems as though with the snow all over UK, put her indoors & work on it slowly.
-
-
-
-
-
I cleaned almost all contact still weird but beat better
-
Thanks for the info, ill make a new mod regulator upgrade soon , already got the terminals , send us an email if you want to try (&you being a test rider)
Video uploaded to vimeo (upload there if you can or Google Drive / OneDrive /DropBox other video upload service because we can’t play Apple videos on certain older android devices)
I saw the video, it looks like its slow to rev up as it may be too cold. Now after 5-10 minutes hot, are both cylinders hot ? and is it riding better?
keep the original airbox & don’t fit the aftermarket one , it looks like its idling under 2,000 rpm (which is the default) , that’s a good sign.
Next step.
idling = what is the voltage ?
At 5,000 rpm = what is the voltage ?
At 8,000 rpm = what is the voltage ?Regulator test, so i need all 3 figures above ^ before i comment further.
-
Hi Marcel, sorry if I haven’t responded these days, I’ve been very busy …..I checked the voltage these days and it seems stable the bike remains between 1,500/1,700 rpm, voltage 14-13.9 5,000 14.3v 8,000 14.4/14.6v however in the end the problem was the fuel pump relay which since I changed it the bike no longer turns off…..
-
-
-
Ok no problem I have received ur email Just I will proceed with payment this Thursday if ok
Hello,
No problem, reply to that email we send you. If you have some other ideas to improve your ride, send me an email and i will check if that is possible so we keep her lasting longer.
Lets try it 👍 -
-
-
Hi mate sorry I have problems with email I tray to send an email to you Just wondering how do we’re proceeding for the item ?? Also I was wondering about few orders I put last week still waiting for news
What errors do you get ?
message me here temporarily until your email is fixed:
https://www.facebook.com/people/BrewMoto/61555775510442/Orders were shipped today (I was waiting for EBC to make new brake performance pads)
-
-
-
-
- You cannot reply to this topic.