♠️ M77
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Hey, don’t panic.
This one is for the older carb models but the principle is the same ….
How to adjust clutch cable – Hyosung GV125C GT125R GT250 GV250
Also , let us know if you think the cable is stretched out , then possibly may need a new cable or is there a chance the “washer” went missing ?
See belowIt says it is for older models , but ignore that, look at the “order of plates” and “bearing , washer” etc.
[Tutorial] Hyosung GV/GT 125 & 250 Clutch Plates Replacement How To
If not, you could need a new thrust bearing possibly? Or new plates if the old ones have thinned out?
Hey Heather, it’s good to have you here 🙂 . Seeing stories like these make my day and for the other contributors of the forum, as they themselves have had to help each other one out.
2 minds better than 1 one right ?
I’ve worked on these Hyosungs (&sttill do) and occassionally i do get a brain fart where i must remember that steering nut at 80nm torque may not apply across every Hyosung , when i worked on the rarer RT125D Off Road Hyosung, so steering got a bit too heavy, i had to dial it down a bit (despite the nut being the same size on its GT brother! Funny times
Oh yeah take it easy with electrics , i did get shocked when i forgot to unplug the battery many years ago working on a different bike and the harness was toasted! (&so was my bank balance!)
Let us know how it rides when you put it back together or shout back at the forum if you need help again.
That’s really great. I was going to stock up some few sensors from several cars but alas , they are not “plug & play” as such. So this gives me an idea to just make “home-made” connectors and sell them if people struggle , otherwise this topic helps.
Great pictures!
People have much more luck using
Oxford Strap Nav , Buffalo Nav Bag , or “Yoke GPS Bag” , but measure size of your phone for fitment or GPS Satnav.
If not, you will need to measure your yoke nut (thread and pitch), then see for any Amazon sellers who may have install kit for your bike.
I forgot what the size off the top of my head , and normally i just use Bluetooth Intercoms and phone is in the pocket , i just hear directions if im going far!
Did you click “Upload Tab” as soon as the “Add Media” window pops up.
Then it asks to upload directly to the site, instead of asking for a “sourcel URL”
let me know.
Also this one below is cheap, just remove the “risers” , and ditch the silver yoke away as it wont fit your bike, or sell it back locally if need be. Or use it to test something before installing on your GD
https://www.ebay.co.uk/itm/254609879686
Hello, since I decided to replace the timing chains right away and, while I was at it, the already dismantled cylinders, I stopped at the stage of removing the magneto… Do I need a special puller for it? I have a puller in my workshop, but it is too small to fit the magneto. Are there any other ways to remove it?
I checked the serial number of the tools from the service manual, but I don’t need them for that amount of money, as I will only use them once. (hopefully 😉 )Try M30 x 1.5 puller from Amazon, it pulls rotors of different 125 motocross bikes.
Is there anyone local in Ireland who is breaking a GD250 NAKED , so you can get its top yoke and risers ? It will be easier getting a naked version.
Sorry if the Add Media button was confusing, did it come up with an error or ? Or is it too clunky for phone use. I will take any feedback to design it myself (i am 100% going to renovate the site later in the year so its more simplistic to navigate around)
Regards
If you must use your current setup , remove the clip ons and be warned:
- You may need longer brake hose
- longer clutch cable & throttle cable possibly
- Find a local breaker and get “2005-2016” GV125/GV250 risers that fit 22mm bars (MUST be this specific year range)
- Drill 1 hole each side, you may run in to trouble , so do it very cautiously or pray we can find a spare yoke to test things. (GD or GDR)
GVs use one bolt risers per side and are much higher than chinesium ones. It is the top yoke we have to worry about giving us a small flat section to sit them on.
That’s great!
Do you have any pictures you can share ?
Can you show me a picture of your current GD250R ?
Hyosung either uses a Flat Yoke Top or a Diamond Shape Yoke (which can make things tricky!)
Click “Add Media” the green button above your text-white space as you reply. And upload it directly here.
Welcome to the forum & to the Hyosung world 🙂
Send me an email , I am officially doing it now as we just did a few private orders this week but i will be officially announcing it on the shop page with new customer pictures etc. A belt is too expensive for some people now and it is still specific to Hyosung
If i ever find a bike that uses same belt and pulleys like Hyosung for cheaper, then i would be stocking it up a long time ago. Hyosung still makes belts , just with a different outsourcing company because their newer Gv125 EU model uses belt drive & GV650PC 2025 uses belt.
So if you need a chain kit now, contact me below for a quote:
Turn the Key OFF
Press & HOLD select while the bike is OFF
Keep holding it
Turn Key On.
Wait… until it changes to KPH , then let go of the button
Did it work ?
Hey, So its just best to find a good used engine from what I gather. I know that the compression test has to be done at operating temperature, but since I have to buy one second hand and I cant test it at that temperature before because its off the bike. I can however do a cold compression test because the starter its still attached to the engine, how much compression does it need to have cold just to be shure that the engine its somewhat healthy? I know they loss compression with temperature but mine had almost the same results cold or hot. So i gather that if at least the compression is good cold, I have 80% chance of being the same or little less when hot?
Usually if it says 125 psi cold , it “could” jump to 150 psi hot (OK to use) or jump 10 extra psi max , depends on engine to engine , hence forth we usually get the final figures after the engine has run for 5-10 mins hot.
Compression tester used should be OK , but just make sure it has a straight metal pole than using flexi hose.
its a 09 Mitsubishi ecu with the 2 hole TPS, I assume the one in the shop will do?
If it looks the same as the shop one , then yes it will fit it because later EFi models changed to a smaller ones , and then again in their later 2020+ GV650 models (Since the GT650 tends to get GV650 parts sometimes shoved in by the factory)
Well it’s going to be a fuel injection one I assume, with the stator burned out the rectifier is almost certainly toast until that side is sorted it’s going to be a nightmare, if the voltage isn’t correct then the ECU will just play up.
Auto correct stator isn’t burnt and reg looks ok it just won’t spark at all
Hyosung regulators have always (even the chinese £10 clones) been smoking the bikes or causing all sorts of cvharging issues.
An ECU is not cheap or possible to acquire right now, it doesn’t take much to fry it as Simon said.
If you intend to keep her for long, this will be the most important – numero uno – investment on the electric side of things.
[Regulator Upgrade Part – GV125S ]
Test your stator as simon says and report back the readings.
Use this as a guide (ignore that it says GT125, the instructions apply to all Hyosungs as they still use 3-Phase stators):
Rectifier – How to Test Stator , Battery , Regulator – GT125R Carby
Simon knows enough , go with what he says if i don’t reply. 👍
Welcome Fella ⭐⭐⭐⭐⭐
Go right ahead & fire away 🙂
Also share pictures of your ride if you want so we can see what you got up to 👍
Camshaft tensioners – I’ve checked them, they are moving smoothly, and the spring it’s pushing these pistons quite hard. 
Plugs – they are looking good? They are afer my first valve clearance and done on it approx 20km, 10km test drive, and next 10km to my garage. I’m thinking they are not oily, but I’m guessing they will need replaceing… They are NGK IRIDIUM CR8EIX, replace them with LASER IRIDIUM? I will redo clearance, but if I’m in such a position with the bare bones of my bike I’m thinking to replace the camshaft chain right away. Marcel I will write to you an email for a quotation.If you’re sure the tensioners are good, then no problem. Usually if i hear them making noises , i replace them immediately.
Laser or normal CR8E is better. I don’t think Hyosung bikes like “iX Iridium” plugs very much , despite them being overhyped. If my bike is good and well taken care off, i can survive 2-3 years with the same Laser Plugs. This is far cheaper than replacing plugs every few months / few thousand miles, it gets expensive
It is like getting a K&N Filter , you don’t need to replace stock filter all the time anymore , expensive is K&N to buy now but it makes long term financial sense.
Hi! I did it just like you said and it bumped up to 11 kg/cm2 on both cylinders. I just have to open them and see inside and look for scratches or the state of the rings right? If it is just the rings, where would I find them? Hyosung doesn’t have anything for this bikes here in Spain.
It is easier to find used pistons and cylinders on ebay. Some sellers and myself regularly list them there because Hyosung Korea is not making parts for any bike before 2019
So they only make parts for current models now (Gv125-S EFi 2020+ , GV300, GV250DR , GV650PC now)
However , I am still busy studying and researching different rings , until i can find one that will fit GT125 , then i will list them on the shop but for now, our best hope is used parts. Lets hope it is just cylinder or head-gasket leaks.
Hmmm! Good question, auxilary canisters dripping with fuel is easy for carb bikes but alas with EFI we need the physical tank pressure and also the pump can’t run dry whatsoever as it kills it.
How about this….. .”USE EXTREME CAUTION” and wisdom please….. but with that , lets:
- Go find a good spot in the garage, and see if you can get hook in the ceiling beam? a strong one!!!
- Get a cargo net x 6 , yes 6 cargo nets
- Put the tank onthe cargo nets x3 (3 nets at the bottom)
- Then use them with someone next to you to hook each end of the net with some kind of towing rope on ceiling
- Repeat again with 3 cargo nets, it sounds crazy but you want to avoid any situation or pump shakes causing the tank to fall down as that’s an instant fire hazard.#
but again …use extreme caution and wisdom!
Run to halfords and get 8-10mm braided hose and fuel clips and come back home , connect the pump to the throttle bodies and tighten#
the tank must be high enough / low enough that you can still use electric plug to connect it without pulling the harness!
now you can actually test what’s going on under the hood with the tank that’s hanging above the frame
I hope this makes any sense ?
I think you could try a local car garage and ask them who does local stickers , and show up with the bike so they can take measurements and print it for you , they may copy the hyosung logo from the internet though!
If not, there seems to be a few ebay sellers already making “pre-made” stickers for the bike, you could ask them do some custom writing if you like.
Compression test done (with a flex tubem didn’t have the metal type near me)
Front Cilynder: 90 PSI (6,4 kg/cm2)
Rear Cilynder: 91 PSI (6,5 kg/cm2)
Check valve clearence and everything checks okay in both cilynders (done it previously to warming up the engine)
What does that mean?
Do it 1 more time again, and this time try:
- Pour a little tiny oil inside front and rear intake pipes for the carb, so that oil goes in the cylinders , then see if compression is improved ?
(piston rings or possible slight damage to cylinder walls of the piston cylinder) - Try to get it done with a “metal pole” as it is far more accurate , flexi-hoses have always given me mixed results (sometimes good, sometimes bad) , so i always try to use a metal pole.
