♠️ M77
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Turn the key on and off 3 times in quick time , then wait for the FI light to flash or trick the ECU to give the error code
Download the latest GV650 manual in this forum (i will find and upload St7 manual soon) , I don’t know why i forgot to do that! Since i uploaded almost every 650 manual on this forum.
Generally DELPHI ECU on the St7 and Delphi ECU on the GV650 will give the same error codes. Just the dashboard is different on the St7
Otherwise, let’s try to diagnose it ….
– When you turn the key on, check these 3 items (crucial!) ,
does the neutral light go green?
is the clutch switch on the handlebar broken or still working ?
is the side stand switch working ? (or just bypass it by joining the 2 wires) – i recommend every hyosung owner to bypass side stand switch!Then you do you hear the fuel pump prime (whining noise) at all ? This is very important.
Regards
PS. I got your email, i thought it was best to respond here to see what’s happened to it.
Check voltage on the line that’s illuminating the other side of the bulb (since its dual filament) also check voltage at the switches.
Also turn the headlights off (remove headlight bulbs) , see if that helps.
Not possible with any of hyosung’s parts. Maybe buy a GV125-S EFi donor bike and try to retrofit everything in to the GT Frame (not easy but not impossible)
Stay with carb, EFI = more problems if things go wrong as they have a LOT (A LOT) of sensors!
Or maybe find some custom megasquirt ECU and learn to program it , and go through some trouble finding needed parts to make GT125 EFi (the effort will mean it is still better to stay on carbs)
Yes bypass it.
Also check clutch switch on the handle bar, if it is faulty , it will shut off engine once in gear (don’t bypass) find another common bike in your country’s junk yard, that uses similar switch as Hyosung.
Show us a picture of the connector and where it is going (trace it) , and i will explain what other wire colours do if you show us.
Regards
Check this link and follow it , then come back to this thread to see if it even helped or not.
At idle Does it stay 1500 rpm ? ==== > or does it do this 1500, 1700, 1400, 2000, 1500 ?
Is it steady or flactuating ?
F1 flashing 10,1,2,3 🙂 hyosung gv650 EFI
What year is the GV as it will have different ECU’s based on the year it was made and also can you see the error code on the scree? Eg. C45 on the actual LCD glass.
Gear Position Sensor (Neutral Sensor) = Faulty or broken wires inside
Or
Clutch Switch handlebar has problem (actual switch or wire broken inside)Also if there is power loss at 1000-2000 rpm = Does it idle okay in standstill or when you idle , does the RPM needle jump up & down ?
It might sound stupid, but have you taken the “Slides Off” (carb diaphragms?) , what if it revs past 7k, then the slides stick ? incase they are too scratched up (then its time for a new set) and also verify the mixture is around 2.5 full turns out each carb , and leave it there forever.
Test ride it again, to see if it helps.
And also try this free mod (Slide Tuning Mod)
Also have a can of carb cleaner, when she is idling and revving, spray carb cleaner around the airbox and intake pipes = Do the revs change ?
If yes , your airbox is loose
Or the intake O-Rings are shot , meaning as soon as lot of air is sucked in to the bike (full throttle), the slides hang due to excess air still passing through ?Like these little ones (if its a 2004, it is probably time to change the o-rings), like these you see here
Intake Pipe O-RING (Inlet Boot Seals) x2 – GV125 GT125 RX125 GV250 GT250 Hyosung
If we can confirm 100% the intake & carb side is all good. Then we can progress to the electrics.
As per Simon.
And also check under the radiator for the ignition plug , incase of corroded terminals going up to the ignition key.
Beautiful & FUN!! off roading machine, i think the trip was well worth it. I hope you will keep it for a long time because you have been waiting for it!
Here in UK it is also very rare now because stupid kids do not know basic maintenance., so they always end up in junk yards. I own one and it is being revamped for one of the inlaw’s cousins (better it stays in the family so i keep an eye on it hahaha)
I am a little jealous because yours looks in better condition than the ones sold in UK!
Make sure to strip it down and repaint frame and exhaust because exhaust is very hard to buy now. The mud in the fields can be unforgiving haha.
Welcome to the club!
Be sure to start a picture journal and i will follow its progress.
Keep her 👍👍👍👍
All black or livery-version of an SM = I would be cool either way 😀
Welcome!
I’m a little jealous because i wanted one for years as as little fun go around (though they are chunky in size) , I have the RT version so that’s okay for me in the rural fields where we are in the north west UK lol.
I’d be keen to follow this, so have a project journal set up on the forum 😉
Funny , I just had to do a custom 520 chain kit order for a customer today because he couldn’t find a 46T 428 sprocket that’s unique to the RX SM / XRX SM models you have there , i said scrap the 428s because they don’t last long anyway, so he will probably login to the forum in a week or so to leave feedback on the big 520 conversion upgrade. He wanted to go a little faster too.
Welcome!
We have a few Koreans on the forum, one of them was helping us test many mods on this shop 🙂 , he has a GV300S now. You might meet him where you are by random chance haha.
The early 2005 GV models and ALL OF THEM until 2020, replace these parts right away:
- Regulator. It burns too much. Outsourced part, so Hyosung doesn’t make them
Check these parts (caution)
- Fuel Gauge – Check the sender inside the tank, sometimes it gets sticky
- Fuel Gauge DISPLAY – If the sender is working, check front of bike MPH/KMH gauge to make sure the “fuel level” sensor is 0 (zero) when bike is switched off and if the tank is half full, the needle will be about half full, this confirms everything is working.
- Spark Plug HT Caps = Use NGK ones , because the OEM black ones fail due to heat or sparks also leak! , we use NGK caps like you see in our store and do not worry about it.
- If possible, strip the bike down => Use “ACF50” (only this bottle) => Inside EVERY “connector” you see on the bike, this will help stop connector pins for various electrics from rotting due to harsh winters , rain , oxidizations etc…
(Hyosung started using waterproof connectors on GV300S models, as they were aware of it)
If you want to hide more plugs from weather exposure => Get “SUZUKI HARNESS BOOT” , it hides your plugs/connectors all over the bike (Hyosung uses them , but not enough!!)
Good electric parts
- Stator , if it is black then it is OEM, it lasts a good long time with a good upgraded regulator but you must test it to verify it isn’t “over supplying voltages” or “wires do not have too much resistance”
- Dashboard works well most of the time, as long as it is not cracked or damaged , then no water will ruin the circuits but check for rust under the dashboard!
Regulator is the most important upgrade. And do NOT use Aliexpress versions, they are much worse than Korea made version. Do not worry, older Honda CBR also has regulator problems , even old suzuki bikes used to melt their connectors for regulators!
Welcome to the club @jprei , be sure to make a new topic to introduce her with some pictures and ride safe this summer.
You can always buy the 2007 version from skidmarx but it will require a lot of cutting to fit and might be messy unless your local fabricator can make a nice retrofit job of it!
The same Skidmarx company makes the tasty huggers for our bikes (thankfully it fits all years of GT bikes)
Good luck
Have you tried WhyGoStock company in USA? They are a hyosung dealer who may be quicker. I sell stators but i have yet to find an upgrade version due to strange connectors Hyosungs. Although ill be doing a regulator upgrade for it shortly as the OEM regulators are hot fire hazards.
Any stators i get for the GD usually comes with a flywheel that cant be separated in the bundle.
No other Hyosung works but you can use the Naked sister’s parts yes since R & N models share the same engine & ecu
They don’t exist , so you will either need a random bike such as big Yamahas (don’t quote me on this as haven’t tried it personally) or preferably , get someone who does seat cowls for a living and give him your old seat to see if he can copy it and make a slimmer delete version.
Regards
PS. SKidmarx UK makes them for 2007 models , they refuse to make 2016 versions.
Hey,
Have you grabbed the service manual on this forum , to learn how to trick the ECU to giving out the error code ?
Assuming everything is “all hyosung” inside the bike, the dash will say CHE meaning KillSwitch Red Button is active OR ECU isn’t responding OR ECU can’t read the harness to start running the motor.
You said it ran , but what changed if its not running now ?
