♠️ M77
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After Month of searching Parts in the whole Worlds, several scams (parts payed but never delivered)
You should name and shame them so that other people can avoid them
Crazy world!
You can go to the car shop or motorcycle shop and get this….
- 4mm outlet “Plastic T-Piece” or “T-Junction” even in Brass or Steel Metal from also DIY shop that does water plumbing etc.
- Get 4mm-5mm vacuum hoses for car or motorcycle (not plumbing shop)
Hmmm i would also caution that in the valve assemblies in the heads, there is some valve seals or cotters (did they get rebuilt/refurbed?)
, and have you also looked to make sure the “Tappet Buckets” actually slide down & up when pressing on to them so there isn’t some kind of resistance or debris wedging in to the walls ?Have a look at the spark plugs , because they may spark but what if they spark yellow (meaning its time to change it or the electrical system is weakening = eg. Coils & Caps as a married pair)
A bad cap makes a bad coil or vise versa that’s why we change them out anyways to better one. (can’t go wrong with NGK’s)If it has IX Iridiums , put them to the side and try “NEW” stock CR8E and go for a ride or LASER Plugs (like these)
The Hyosung 125cc twins don’t really like the “Blue Box IX Iridiums” that’s why henceforth.If woes continue, take a picture of your plugs so we can see how dark your threads are and what colour is the center.
If we can sort the “Plugs , Coils, Caps, ” first , it becomes a lot easier to diagonose fuel system next (if she is still in a mood)
Worst case senario ? = Compression Low or Valves Too Tight (can’t escape this , as it will need doing for all hyosungs , if the last owner did not do it)
Best case scenario ? = Carb gets an ultra sonic clean (no rattle cans) , has to be ultrasonic and or air compressor in the entire carb body as it has many holes, change the ORINGS under the rubber intake pipes (they cake with age, so we replace em , like these ones …) and don’t play with mixtures , but do make sure float height is 7mm (see this link and look for a picture of float height) <– That thread is also a good read too 🙂
Well I just keep finding new things lol. Still waiting on the das guy on eBay hasn’t provided tracking details been over a week getting frustrated now.
Chase him!
Don’t throw away the old dash , we might have it as a test bunny if you don’t need it anymore lol.Well I just keep finding new things lol.
keeps you busy then , you know you love it when you solve problems and the bike shows its mood later on 😉
I will not be defeated lol
That’s the spirit!
Will look in to this during the day tomorrow (monday) and see what I can do 🙂
Although I deal with sales of parts , with imports of them and what not in the trade and sell bikes (used that are are already registered) , but i don’t import bikes as that was licensed to MotoGB to do it initially.
Can you try give Startright Motorcycles Leeds a call and say Marcel sent you. I live not far from them and they are still an active hyosung dealer and the oldest Korean dealer since they also do SYM & Daelim bikes. They know the mess of registering a bike. I bought a brand new spanish bike from them and it had to come from spain directly to them , and i saw it in a crate box , all that was left was to register it.
It didnt “NEED” MOT as it was a new bike, no MOT required for 3yrs (standard isnt it ?) = So why you had to get MOT on your new unridden bike is a surprise to me to say the least.
if MotoGB has details of your bike , and details of the contract with KR Motors (confirming that KR Motors sold it to them etc…) = This proves the manufacture’s involvement , this would come with documents to say when the Koreans made it)
Ie. Bike MFG’d = 2016 , Seoul Korea // Exported 2016-5-5 // Recieved by MotoGB 2017-Jan // Local UK bike shop acquires it 2017-August & has been in shop floor since then.
That makes the shop either the 1st owner of it (if they pre-registered) before the 2019 (circa) euro 3 / euro 4 switch over
I know for a fact i am speaking to an owner on FB that has a brand new red 125cc 2022 plate (Yes, 2022 plate!)
last year i saw on FB groups , 21 plates floating around , of these same Hyosungs.
Whatever hoops they went through, they were determined to get it done. Despite (after 2018/2019 bikes must be Injected with ABS/CBS which the 2016 bikes do not have)
I’ve not seen a Q-Plate GT125R , so i would be amazed either way its allowed on the road in whatever case.
Sorry for any gramar errors above , i was digressing!
Just got the spark plugs you said to get, doing a carby soak and yeah I rember all the fuel lines xD would you know what that random spot of oil is from on the throttle pivot point ? The last pic
Blow-Bygasses that turned to mist , then oil paste (like you would see inside the airbox) but in your picture i would double check the intake rubber pipes are okay as it may have escaped through as you can see also.
So after all that .. the previous owner had installed the fuel filter upside down -_-
Happens all too often up here too! – Well done for spotting but the previous owner has probably lost my respect for such a simple thing to get wrong. i mean fuel filters usually have direction arrows, if they didn’t the base where mesh canister inside sits is the OUT flow.
I wish you the utmost lock and anything you need , we got you 🙂
And please do keep sharing the pictures because i actually love seeing those bikes get a 2nd chance on the road. They are wonderful to ride , i could be biased but coming from a Kawasaki and GS , the hyosungs are nice chunkies in their own right.
I went to shops with my GV and i couldn’t believe how narrow the Suzuki GS500 looked compared to my GV lol. I’ve forgotten , that’s how much i’ve got used to hyosungs as my main toys but i supposed i should give other branded bikes i have some loving this summer!
You got this fella!
The BDS-Twin carbs used by Hyosung with Mikuni Japan making specific brackets for Hyosung bikes means even the airbox & intake rubber manifolds don’t any other carbs besides the OEM ones. Also there is also the issue of the engine moaning, its a tunning hell to use even Keihins but hey , sky is the limit!
If you can make a special airbox (Cone Filters are crap & always will be) and make special intake manifolds to hold the carbs in , then you could try to do it.
Also engine design expects “twin-carbs” (1 carb for each cylinder) , pistons don’t spin at the same rate/time. Unlike other vtwins. Hyosung sometimes is in a world of its own 😉
May i ask why ? The 125cc can never exceed the power capacity of the carbs because the GV250 also uses it. But tuning and ultrasonic cleaning is what goes a long way
Assuming “compression is 175 psi” – Clearances are “0.10 ish IN and 0.20 ish EX” – Clutch plates are 2.6-3.1mm thick, then engine is OK too. Sometimes a good carb is let down by a poorly engine or bad electronics and vise versa.
I hope you remember where all the pipes went because i forgot to make a tutorial on how to do fuel diagrams for 650 , i must really get on it! Sorry.
The carbs would still could do with a nice clean up inside and outside, they look better than the rusty carbs found on other bikes left in gardens to rot , so you will have an easier time blasting it clean.
If in doubt, check the jet sizes on it too. Also it is a shout that you could always give it fresh valve seats for the floats as they control how much fuel comes in before the floats shut em off , and fresh gaskets lessen the risks of fuel leaks , if the carb hasnt been touched for a while the gaskets may have been caked up a little bit.
(See the hyoriders shop)The bike has a Vacuum Mikuni Pump near the yellow bar where fuel tank sits on. It is not electric , but it rarely fails unless again , if its been a while you could always replace it. If need be, i can send over another fuel pump from our running donor bike.
Since you live in AUS i understand if shipping times between UK and AUS are not something you want to wait for, it is possible i may use faster logistics , but send me an email for any sales enquiries.
The spark plug looks to be the wrong type , i would get CR8E new ones from any local store that sells bike or auto parts. Try them first. Don’t bother with DENSO or the crappy Iridium IX plugs from NGK. The 650 will be happy either with its stock CR8E or LASER NGK plugs (See hyoriders shop)
Try CR8E first before upgrading the plugs.
The ignition coils that sit on the frame , need the area to be free from rust as they use the frame for “ground signal” , the same way spark plugs use the engine + frame + battery negative as ground signal.
Sand off the rust till its shiny, then apply a thin layer of ACF-50 (No WD40 please, its a fire hazard!) = ACF50 is every biker’s must have and it will not go on fire. In fact, use it inside every single wiring harness connector on your bike (that way wiring harness plugs in your bike won’t oxidize too much or rust away)
Thanks for the welcome, bit far to push it to Yorkshire, but a kind offer.
Not too worry if push comes to shove , we do collections but only when your local choices are exhausted then we can help. You got this covered im sure 🙂
Tried that and got bubbles out top, but decided to look closely at caliper. One piston very difficult to get out and badly pitted, so I’ve decided to get new master, caliper and pipe-line! Looking on ebay it’s nearly as expensive to get repair kit as to buy new complete caliper from Hyosung.eu. One thing though, the master doesn’t show the stop light switch. Is this transferable from mine, or will it come with it?
i hope you get the correct parts , otherwise i can always help you as usual. I even sell stainless pistons. You can keep your old caliper. No need to replace it, its downfall is always the cheap axle pins and pistons, hence we do stainlesss so you won’t worry about that again.
Master cylinder , the GV uses a different switch that’s like a cylinder which goes in the GV master cylinder. Others will be a switch box under the lever with 2 spade terminals. So it may mean cutting up your GV brake switch wires.
Don’t cut the main bike harness (very difficult to get one) .
You can get
2x spade connectors (to connect the aftermarket brake switch box if using Non Hyo master cylinder)
2x speaker wires
1x harness jacket or a long shrinkwap to encapsulate the 2 wires like what hyosung does with their 2 wire cables.
1x tape (waterproof up those wires!)
2x “bullet” connectors (to join main bike harness) (if i remember correctly! as i am a little drunk as its weekend!)
I would have done this while i was getting you a master cylinder so you can just fit and play.If the tank has a vacuum petcock under and contains fuel. The tank that’s on the table should not be pissing out fuel, That’s bad. It would cause hydrolocking if the carb floats fail and you have fuel inside the pistons and a very stinky “water-like” oil. I would not ride the bike until such fuel parts get replaced one by one.
Very good question you asked!
Hey welcome sir!
Fire away with any questions and pictures when you make a new technical post on this site.
If push comes to shove , just send her to Yorkshire as i fix the Hyosungs on a regular basis.
Keep her , when summer hits you will enjoy it for what it is 🙂
it sounds like it could do with a quick check on the carb jets to make sure all is correct , and while its apart, why not give it a long ultrasonic clean job as it will really thank you.
Also pull out your plugs , check they are the correct ones and if you want, you can upload pics of the plugs so we see what your mixture is like.
Have a check on your fuel tap and fuel pump too, sometimes if they act funny, they can hold back a lot , so the carb feels starved off a bit.
Let us know how the fuel system investigations go , before we look deeper elsewhere on the bike.
You got this!
As mentioned before on social media, i can repeat it here incase anyone else is wondering too 🙂
H3 55w max 12v ratingH1 55w 12vIMO my fav halogens areOsram NB bulbsAndPhilips Xtreme VisionDont bother with LEDs UNTIL Osram & Philips start doing it with road legal markings but most dont fit inside the headlight casing due to them having grills and cooling fans atop them. Too messy for now.Have you already found a GT250 in your country that’s in either;
– Salvage Yard (Breakers/Dismantlers)
– Dealer shop (used , so you can have a backup donor for parts)
– or someone selling a hyosung locally ?It is easier to try to use the OEM GT250 parts as everything fits together nicely.
You can heat up that area a bit since heat causes metal to expand slightly and soak in some old bike oil between the pipe and the reducer, so you want the walls to slip up and pull it out.
in the end with penetrating oil, angle grinder and 3 hours, it’s finally out….. turns out they used JB weld the b****ds.
That’s just evil lol. Glad u got it sorted.
Hmmm, do you know what jets are inside the car already ?
– Pilots = size? front and rear.
– Mains = sizes ? front & rear.Can you also get 3 pictures of your spark plugs ?
– Side view (threads) = I will gauge if motor is overheating or not or oily threads etc…
– Top center view (I’d like to see how dark the middle cone is (how well its sparking vs fuel mix vs air)
– Name of the plug (ie. CR8EHX incase previous owner put the wrong plugs for it)Keep us posted with the specifics , i shall help narrow things down for you sir
