â™ ï¸ M77
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Hope it works out well and you have spares for the future. The 650 is always fun to ride when everything works!
Would it be possible that your coils (on their own) or the HT Caps (problematic things) could be dropping out , wanning so that they fail & the bike cuts off ?
If the ISCV is truly working, have you tried a 2nd ISCV that is new so you can fully rule it out?
Can it ride in general (besides the idling issue?)
I am suspicious of either the stator pickup coil (wanning/haywire) or engine HT Leads+Coils or the ISCV unit.
I am not sure about injectors yet not unless your plugs are sparking dry / lean ? or fouled up bad ?
Grab yourself another set of new HT caps and coils to be sure  (Stator , not sure yet but keep that in mind, usually if the stator-pickup coil goes at any point, so does everything on the bike and bike shuts off as it depends on it, the ECU checks that 1st)
I cant remember what the code is on Daewoo as its been a while , but on my Delphi if the ECU thinks my stator is suspicious , it sends a FI light with flashing sequence to translate to “pickup coil / no signal or pickup coil / noisy” etc and bike didn’t start till i replaced it but if it did start, i would see crazy jumps on the RPM meter then it dies.
It’s in the forum service manuals uploaded here:
[DOWNLOAD] Service Manuals & Owners Books – Hyosung GV650 & GT650 (Carb & EFi)
Regards
The closest i can get is 10-3-5-1  (Failing ignition coils)
Nothing i can see here for 10-3-5 (0r 10-3-5-0)
It has a spring, and washers and a sieve in there, it is purely for the gearbox cam shaft, because there is small parts there, so easier to service it after a rebuild, this is something of a concern for engine builders or garages rebuilding a damaged engine.  It’s just an overengineered engine to be fair.
So general riders are told to just focus on #2 for oil changes.
1 & 3 – For gearbox area, so you got lucky!! _ Ignore them next time. Drain Oil using #2 in the picture
so the fact I drained from #1 is ok?
If the gearbox is OK and running, then don’t touch it again.   You got very lucky! – Most owners who drain that #1 hole end up with all kinds of issues and have to rebuild the bike again.
You’re lucky!
Stay on #2 going forward , like this tutorial
[How to Tutorial] How to Change Oil & Oil Filter on Hyosung GV125 GV250 GT GT250R GT125R
It must have been the moan jet was blocked cause took her out for a spin after cleaning everything and re clamping everything and she seems to running perfect now no sticking at higher revs, also added a fuel filter and tested for leaks with carb cleaner and was all good so I’m happy camper just now!
Happy ending!
Hold tight a few more days, your special part is due to leave later in the week and i believe EVRi will come or RM , but i will definitely edit the order to reflect your new email address, email us by Thursday if you hear nothing!
Take it easy out there!
Replace the coil entirely and get new plug caps , then re-test , you want to rule out that completely.
Also open the stator casing and check the stator pickup sensor has not gone haywire ? CDi sends sparks to engine coils based on this item first.
Then double check the harness.
We hope you don’t have to replace the CDI as the last resort.
That’s new , if you ever do valve clearances next time, remove the cam shafts and tighten the long 4x engine cylinder bolts which holds the cylinder head & piston jug together , but this may help squash the gaskets a tiny bit (a tiny bit) , but worth checking next time.
That is my suspicion , it doesnt seem to come from the top of the valve covers but near the piston area, so could be piston jug gasket rather than engine crank-half gasket (bond), Hyosung uses factory “bond” to join the crankcase halves together, otherwise some people have been rebuilding engines with some gasket card and cut it to fit or they use engine bonds used by cars to bind the cases together , the service manual for your bike (at manualslib) should mention the type of bond used.
1 & 3 – For gearbox area, so you got lucky!! _ Ignore them next time.
Drain Oil using #2Â in the picture
before refitting, did you consider replacing the intake manifold rubber O-RINGS , as these are known to cause hidden leaks causing all kinds of boggy behavior . If fitted already, spray carb cleaner around the intake pipes to see if revs change ?
Does it start without choke when its ice cold ? its a small tell tale sign if things are good under the hood, and normally it should not need it heading in to summer now.
To rule electrics out, check this link below and report back with your figures?
Rectifier – How to Test Stator , Battery , Regulator – GT125R Carby
wow , that screw is well and truly gone, i always wondered why the need for brass instead of stainless versions, they do that for the diaphram slides already, but i also would have loved to see stainless acorn nuts under the floats. Saving weight maybe?? I doubt it, the bike won’t notice a few grams being shaved off, its wheels are already a combined 40kgs!
Have a look at this tutorial below , you will need the chain attached as it makes things easier.
[How to Tutorial] Upgrade 520 chain & sprocket kit on GV125-S EFi (GV125 S 2019+ Models)
It says on G Drive “You need access” , maybe set it to public share link ?
Don’t get me started on mixtures either, it’s something i constantly have to deal with in my own workshop sorting customer carbs. Takes more of my labour time than doing valve clearances!
Have you tipped the swear jar so your wallet fills back up again ? 😄
Take a look at this topic , it has a lot of info that might help, (I hope!)
If its 4 pins , same relay is used and typically it stays at the rear seat area and 3pin socket is for indicators.
The carb below is the one quoted in the spec sheet for the 250cc – PD26J. The clone of the Honda 250 rebel carb. Looks very similar to the Hyosung carbs.
How can I send PMs in this forum?
Thank you.
We did have the PM system before , but because of AI on the scene, I locked it down to stop guys getting silly PMs of AI Robot girlfriends and Ai gold diggers trying to get past this site, so I will figure it out one of these days. Though if publicly one has asked Rider 1 on his forum to contact me to send an email to Rider 2 , then i will facilitate the email exchange, it’s not ideal! but it’s one way around it temporarily – I don’t like adding “are you human , solve this complicated puzzle before sending this message etc” like you see on the contact form , I want less friction for everyone , not more of it. bare with me!
Honda Rebel carbs , nope, but some HAS made their own welded custom manifolds on a GV cruiser with a custom airbox , and made it in such a way that the carbs hang at the side of the bike (almost) and used keihin flat sides, this was many years ago, so can’t find the post on social media. I thought to myself, ahhh narr , I will just get another OEM set and rebuild it patiently! – carbs take too much of my workshop time but i will always choose them over 30+ EFi electronics i need to stay paranoid about.
Cost of living on the world isn’t going to make a rider fork out £1500 for an engine, they would get a whole bike for that! – 50+ units could work for a dealer though if they have a fleet of bikes and need spare engines for their customers in their workshops.
