♠️ M77
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Ok no problem thank you for your reply I will just take it in a see how it goes on another note last owner did away with front indactors and instead fitted mirrors with built in indactors have you any idea if this would be a problem with mot or should this be fine thanks
It should be fine as long can be seen working those indicators 🙂
How to find the tutorials for air and fuel?
Here you go 🙂
How to upgrade Fuel Lines & Filter on Hyosung GT125R GT250R (Carb Hose Diagram)
How to change Vacuum Lines on Hyosung GT125R GT250R & GT Comet (Air Hose Diagram)
On the GTR, there is 2x adjusters behind the headlight box. Its done gently with a thumb screw , as they break off easy
This website says your MOT garage will need a specialist equipment to check aim is right, some old bikes sit high , some old bikes sit low, there isn’t a proper universal rule now no thanks to GOV change rules as they see fit. I’m not an MOT Tester , but i just fix bikes and the MOT guys check what i do before customer gets his bike back 😉
However, generally , the korean’s set the aim just fine and we don’t tend to touch it again , unless last owner was fiddling about.
I’d say yes as the garage I went was actually a honda garage and they should have known better but they shut shop just before the pandemic. To be honest, all motorcycle garages here are terrible. they’ve all bodged something up and facebook is filled with stories even with common bikes. I think as a rule most just work on their own bikes here. plus 82 quid an hour isn’t worth it to install 2 plugs, throw some pads on and a put some oil in.
WHAT!!!!!
82 quid per hour! for 2 plugs ?
Sorry but you will get a wayyyy more premium service with us for way less.
Yikes!
I will send your goods soon, but bare with me for extra 2 working days , i think we just had in influx of EGR blank orders, so gonna ring supply chain to send a big box again 🙂 , when you get the usual “dispatch” email, it means goods are with your postie 🙂
Hi. Thx. Theres lots of things that need checking. Might just throw it in a garage and see what they say. Its becoming a nightmare
it’s overwhelming i know but do your best to study it in the flesh and read the books, and just overhaul one small thing at a time!
Hey if the garage is crazy or takes shortcuts (makes it worse or lies) , just bring it to us but i hope it doesn’t come to that! (If it does, send us an email about private arrangements)
This public forum is still open for any support questions you might have. ofcourse pics help a ton too.
Good luck, we’re getting somewhere, there is light at the end of tunnel 🙂
Well good and bad news. Good is mystery solved. Bad news is 100psi not enough to start engine. I put tablespoon stp thick oil in both spark plug holes, rose compression to 120, 125 psi cold. Plugs in and it started. Of course burning oil lol out of cylinders. So, need rings and cylinder jugs it seems. I bet someone ran this on low to no oil because low mileage 8,444 miles only… Ih well.. thank you all.
Save her 🙂
Have you got a link to a stator for a 2015 gt125 tv up graded one as I can’t find one
Uprated Magneto Stator Generator :: For “GT125 RC” 2010-2018 Hyosung {Custom Kit}
Add
Fresh Oil (of your choice. Motul 7100 and Silkolene Pro 4 are my favs)
Oil Filter Kit (always) (it’s at the shop too)Hey Steve , send me an email , sorry i saw this late. I am based in the UK, and i have a lot of injectors, throttle bodies , IAPs , MAFs , Lambda Sensors, and what not
I’ve literally stripped a SENTEC 2008 bike that was running well , it is 250cc and i can confirm Sentec sensors will work with bikes with DAEWOO ECU up to 2018
I have also removed a whole harness from a 2008 GT250 Sentec with ECU intact, i can’t sell separately but i can imagine they go for hundreds of dollars due to rarity!
GT wiring harness is hard to use on a GV because you will need GT clocks (speedometer) and custom fixings to fit the speedo to dash , plus some wires may be cut to retrofit rear GV lights but im sure front headlight will plug straight in.
I am digressing…
Did both cylinders even spark bright and what colour ? And was the seller honest that the ECU works well ? No FI lights on your GV ?
Or have you found a way to trick your ECU (as per service manual) to get some kind of stored error codes with the new ECU ?
It’s ALIVEEEEE!!!!!!! (Jim Carrey Voice)
Hey hey hey , get that girl going and you won’t need to spend hundreds of dollars on a carb! – If you must , clean it to the extremes and also use air compressor!
(I love air compressor after chemical baths , i mean i get to really blow every crevice , hole , slot , slit i can find in the carb, its a lot of passages lol)
Thanks so much for your kind answer, Marcel. I would like to receive more feedback, specially by Spanish members. Best regards.
You can search for Alan M on this forum, he rides a GV125 & is very active on this forum. You can send him a PM , he lives in Spain too 🙂
Temp Sensor is not available for a 125cc 2016 plate because it doesn’t use “water radiators” .
It has an oil cooler and Korea saw no need to put a sensor on it. However a 250cc cooler is the engine’s favourite investment as it pro-longs its life (Super hot 125 hyos in summer can be moody at times!)
Based on your second reply
- Regulator is shot. Sounds like it’s not charging the battery
- Get a the stator tested though. (Hyosung says if it’s not making minimum 70v AC on all 3 yellow lines, replace it)
(Search on the site “stator” , for old topics to come up , there some multiple replies made on where myself or Simon explains how to test stators)
or
Download on this site GV650/GT650 service manual and “only” follow the section where it says “How to Test Stator Unit” , ignore everything else in the book as that’s for 650cc but 125cc/650cc have the same readings for stators. (Just 650 is bigger that’s all)
It sounds electrical , if it has a standard regulator (Says Hyosung on it or HANKUK Korea) , then it is advised to replace it with a beefy one.
Searching the keyword “stator” will bring some old topics in this site on where multiple replies were made on how to test the stator unit.
So i’d say , a healthy stator (making 70v minimum at 5k revs) is a must. You can even download the GV650 or GV250 manuals on this page and just go to where it says “how to test stator” and follow what Korea says with a pocket meter.
When you confirm the stator is actually making 70v+ (and is under 0.9 ohm on its 3 wires)
Then replace the regulator.
I keepo saying stator because if it’s failing, a new reg will just get eaten up by it and you will likely need a new battery , just in time for spring 2023 , = Correct size battery & brand is YUASA YTX 14BS and get it from halfords or bike shop. Don’t get batteries online due to fakes or sellers selling very very old stock (cells rot if sat for ages)
…..and the one that did, overfilled my bike too as it turns out, lucky it was a garaging service rather than a running one….
That is just appaling!
Owner’s manuals still exist on the internet, can i shame them?!Hundreds of dollars to get a new carb you sure about that ?
Maybe email me and i’ll reply with some options in the used market too.
Single body (possibly)
Other twin carb set = Too much swearing to tune right, they have never liked other carbs besides what Korea provides them and as such they built the airboxes + intake pipes with the expectation of such carb.
Look at another recent topic on this site , someone has got a GV250 with a single carb and i was like wow! (The extremes the previous owner went to get it going!)
This is a photo of my GV125c 2012 that i’m working on at the minute to get up to proper running condition. This was taken about 2017 before I ended up having to garage her for a while due to life getting in the way. I was a new rider at the time, so i think this counts.
With the parts being sent to you, it will be purring just fine in no time fingers crossed your fine hands will do some good TLC to it!
Here is my 2016 GT250N My first bike, and the bike i have been riding through the cold Scandinavian winter with.In my fav colour too!
Hi guys. Basically I’ve fitted a new battery but won’t start when its cold on the electric start. I can bump start it cold without a problem. Then it starts easily. Can anyone enlighten me to a solution please
If you can answer all 4 , i would have a very good answer for you.
- Standard Regulator ? And what year is your engine?
- Can you go to halfords or bike shop and get a free battery test? (They have “load meters” that actually test the battery & tells them if it needs replacing or not)
- When you press start ===> Does the dash go really dark and the relay clicks loud?
- Long shot, but has this bike every experienced hydrolocking >? (Fuel leaking in to pistons when bike is turned off, then next morning fuel is mixed with oil , and bike is much harder to crank in the morning (which i would NOT ride it, as its a soon seized engine) , i saved this for last….
Here in UK we don’t use LED’s on our hyosung front headlights because there is also MOT Tests (UK GOV wants to make sure bike is road worth every year 3yrs from new) , so the MOT Tester sees LED inside the headlight that needs Halogen bulbs, he will Fail the bike test & issue notice to biker to say “headlight needs fixing to be road approved etc”
Problem is that LED generally is difficult on front headlights because
- as our hyosungs do not have much space inside headlight for LED Cooling fans
- Osram & Philips do not yet make CE Marked & Road Legal LED’s for bike headlights.
Osram & Philips are one of the oldest & trusted bulb makers.
Don’t follow the chinese. - Current bulbs on market, will not shine properly because they cause “glare” and do not spread light properly on the road
So yes they look bright , but can be “annoying” type of brightness. New Audi Cars do it better , as they have headlights made for this.
For indicators,
In my opinion , i like bulb indicators because they can be replaced easy and it’s only 10w , so it’s good for the Hyosung OEM Relay. Also here in UK, 80% of road drivers are crazy idiots, they can’t see LED indicators because they are dimm , but Korea indicators with bulbs definitely shine better.You can use LED Indicators with an Indicator Relay (2pin will work ok on RT125 bike too) , this one here is totally your choice. You can double check with Spain if there is any laws about this but i am not sure as i am not familiar with the spanish vehicle authourities. Let us know.
We have many spanish users registered on this site too.
Welcome to the forum!
i’ve only just got the bike and i haven’t changed the fuel tap, it’s currently in a workshop and they’re looking for a fix
Let us know via email if the workshop needs anything from us but i suppose they should you and report back here their findings (They better do the work right and not treat it like its china scrap)
Good luck!
There is always a silent grateful majority who like tutorials , thats why they keep coming back we even had some mechanics actually tell us the clutch tutorials were helpful to them in the past, we know that most UK garages don’t really want to touch Hyosungs which is a shame!
They run great when its all working well and it shows its mood too.
I am digressing, so let me address your pics now
You can block this pipe, as it goes nowhere. So make sure that side-mounted air filbox doesn’t leak air elsewhere too! 
This actually goes straight to the ground (road), (breather hose)
If it is the hose that’s connected directly to the tank and its far away from the tap so to speak.
That is carb float bowl – overflow to the road.
– If your floats burst / jam = it drains straight out to avoid flooding carb.
– if the bike falls heaven forbid , then it pours all of it out (well most)
