♠️ M77
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If you you want , send us an email if you have any sales questions regarding the store , using the “Contact us” link at the bottom of this site.
In regards to technical help, you landed on the right forum.
If the bike has been sitting since your last attempts to start it, i would get a siphon and drain the fuel tank (trust me on that)
Drain the carbs too
Also , the Hyosung carbies want E5 fuel onlyIf it is alien to you to work on the carbs, you can always send it to us and we will clean it & sort it out properly , mixtures etc – but again email us in any regards to sales enquiries if you want my services
If you hire a local mechanic , make sure he knows how to work on mikuni carbs on big cc bikes first as these jap carbs don’t play ball if we cut any corners. 😬
While you are here , i hope you have lurked around enough of this forum to see old topics with answers to common questions asked by other members before you
Hey,
Did you replace the coils and the plug caps ?First thing is to make sure there is bright blue sparks from each plug , then we can see about air and fuel next
I hope you keep her , they are nice to have!
Welcome to the site & enjoy your stay.PS, it looks very tidy 👍
It is normal because 2008 was the begining of the EFi switch for 650cc and 250cc , they started with GV Aquilas then changed GT bikes to EFi
But new carb models were still being sold until 2010-2012 (iirc) , because we sent some parts to a customer in NZ who had a carb model 2010 GT250 Naked
The 125cc is the only one that did not get EFi release until 2019I hope this make sense
You will also have what we call “1st Generation EFi” model (Daewoo / Sentec Electronics) in older bodyshape aka (Mk1)
Have you looked on ebay ? There is a few of them there. I looked. Also i don’t usually post ebay links to sellers i don’t know , like you said , some may be scammy but ask the sellers first on ebay if the item is fully tested & working, and it can save you money buying another fried unit.
I have no garage so have to do it all outside. If it isn’t raining it’s freezing haha
You’re the king of your house , bring the damsel inside and put a rag under the bike and keep the fuel tank outside, carbs out and be wise lol.
It’s gonna snow soon anyways , so we should all have our babies indoors (safely ofcourse, so the fire service doesn’t panic!)
Beautiful!
Okay , you need the following to complete the GTR looks
- Left & Right Bottom Lower Engine Fairings (Any GT125R | Gt250R | Gt650R will fit up to 2021)
- Middle V-Piece (Belly Pan) (Front Exhaust | Radiator Guard) => From any cc’s GTR model up to 2021
- GT650R (2005-2008) fairing brackets for the frame (This allows bottom fairings to mount to engine) and also the “nose Cone” to mount to lower fairings too. Some people make their own custom brackets (CNC/Local Fabrication skills etc)
Stock CR8E plugs will be OK, but swervice manual usually mentions spark plugs all the time as half of fuel / sparking issues as if a carb is good , coils etc but plugs are not, the bike will be jerky since those little things foul easy but we need them little things to get us from A to B (literally)
Laser Plugs + Caps + Coils make a good three-way marriage but lets make sure the bike is good for it, as if the bike is good then you wont change your plugs for a long time (I’ve even had laser plugs on my bikes for 2-4yrs and rarely touch the carbs but it could just be me being OCD lol)
Did you get a chance to take pics of your plugs ?
The OEM Caps are not great as Hyosung doesn’t make them, but some outsourced company called “Golden China” . Using NGK Caps does help a lot and they rarely fail with sparking issues as bad caps can cause weird misfiring issues especially when its hot as its buried deep in the engine heads.
You want the rubber NGK caps similar to the ones on our store. Don’t buy “Plastic NGK Cap” , totally rubbish those ones. (Just like regular CR8E Plugs & LASER plugs are recommended but don’t touch “Iridium IX Blue Box” as they don’t like IX plugs much)
The EFi GV125-S uses an entirely different engine , there is nothing from the EFi 125 Aquila that’s compatible backwards to any carby 125 bike and it has 6 valves ( SIX VALVES)
You have the luxury for a 125cc bike with twin japanese carbs (that can run a 400cc) , a simplistic CDI, very simple electronics, and an overengineered engine with 8 valves.
IMO I’d keep it carby. Use E5 forever while it is still there. And use a 250 EFi GT cooler , it prolongs its life greatly with that cooler.
EFi = Be a wizard as most UK garages are too “sensetive” to touch a “Hyosung” , a South Korean bike lol. But they don’t mind screwing up chinese EFi Lexmotos!
Why convert EFi ? should I ask you…
If Hyosung had every chance to make the GT125 EFi, they would have years ago (since they did EFi Hyosungs in 2007-2008 for 650 & 250cc), so i will be very very curious to see how they tackle this one and make it faster than carby with the ever growing restrictive Euro6-7 laws ahead & crappy E10-E15 fuel years later 😬
Hell, we still haven’t got an update to the GT250 & GT650 yet , last EFi update was 2012 when they switched to Delphi & updated its looks but we haven’t got a new build GT125 EFi , they would have to find a way to be faster
If it is a “GT-S” , that means it already has the top half of the GTR fairings like “Screen , Headlight Box, Face Nose Cone” ?
Or was it originally a GT Comet , that was converted to half GTR (GT-S) ?
A picture helps so i can see how much plastics it has on then i can advise what fairings to get.
Also Hyosung changed the looks over the years for all GT models until recent.
Sounds good!
Almost scared that poor kitty off lol – Poor cat, it should be the one that’s purring not the vtwin 😉
Ride safe this colder season though!
@Cobra2 this should be posted as your own topic in the “tutorial” section, that would save a lot of headaches for lots of Gt125 riders
This is very good! 👍
I am suspicious this is the same as the GV minus 1 socket (Some GV’s have 2 sockets only) but i will confirm later 🙂
Was the carb needle on the 1st notch (towards the blunt end?)
Simon is correct , if it goes on the middle slot – can it help ? as that’s OEM. Hence its towards the 3rd tip towards pointy tip, it means you get to “mains” a bit sooner,from stoodstill “pilot” idling.
The reason for the 3rd groove towards the tip is when the slides lift , you get a bit of enrichment since the needle is up 2mm ish out of the carb, so that tends to affect the 4-7k rpm flatness (mid-range) but the 125cc usually revs past 7k pretty quickly on hard throttle when the bike is okay & the main jets simply just take over at this rate.
If the mixtures have been messed with , floats messed with (like Cobra2 says on wrong float heights) = it can throw things off a little bit.
Also when you change gears , do you get any jerk-jerk-jerk behavior then it revs up / rides normally ?
Also can you supply pictures of your plugs so we see what’s happening with the mixture ?
Any intake mods ? any exhaust mods ?
Lots of questions i know but take ya time, more info is good for our heads
I will get a picture for you soon , give me 24hours since i will go look at one of the donor GV’s that has the same CDI as you and advise accordingly
I think a picture of mine would make life easier for you 😉 (that’s if someone doesn’t beat me to it!)
So if you followed the manual exactly (this is after unplugging the ECU for a day & removing the battery for a day) , then you reconnect it all back , do the the paper clip trick, the ECU doesn’t even throw a code ?
And yes a compression test is a very idea at this stage so we can rule out that both cylinders compress enough to start the bike.
Take a look at the plugs , if they are jet dark, then your jets are too big but i think 95 is a max sweet spot 🙂
Post a picture of the CDI unit (it must be a GV stamped unit)
(The backside of it so i can see the sockets)Post a picture of the plugs meant to go to the CDI unit from the GV harness itself.
(Try to space them apart so i can see all the wiring colours)I can try to guide you from what i can see
I think the best setup would be 92.5 & 95 max because the GV Aquilas do not like any air modifications to the air intake airboxes when using the OEM carbs & OEM parts. The OEM air filter is more than sufficient for a 400cc motorcycle. Keep the pilot jets at size 20 on both cylinders. They hate pod filters and will usually show their mood with lack of power and difficulties in optimizing a “pod” setup
The exhaust may be a little beneficial if we use OEM 2002 twin exhaust pipes because for some reason i’ve known that the GV’s really perform best with their old style twin cans. If it is not possible, try to find similar size cans (that reach the end of the swingarm) , like what LeoVince does for GV250s and Gv125s whilst still giving good power and noise 😉
