Hyosung 125 GV 2008 Problem after 1 hr of use

[JoshuaCO]

Hello,

I recently bought a 2008 Hyosung 125 GV that works well other than it seems to sort of lose power, wobble back and forth and force me to pull over after about 1hr of use. When I pull over I put in the clutch and the engine stops. I wait for about a minute and start it back up, and ride for another 10 minutes until the same thing happens. Is this a fuel issue? Overheating? Anyone have any ideas?

Thanks

[unitynotsocri...]

If its overheating you should be able to smell it.It may be a fuel issue,blocked filter,crap in carb,tank breather or it might be an insulation problem from a wiring fault or a defect ignition coil overheating.If its hot then it may be seizing up because of internal engine damage.A good thing to do is change the oil,as with every cg clone.If you drop the oil into an open container you can check for mechanical damage by looking for metal swarf in the bottom of the oil,On a new bike there is always a tiny bit of metal on the first oil change due to everything bedding in ,but NOT on one thats 3 years old.(assuming its been serviced at least once.#
That last bit about pulling the clutch in making the engine stop is a strong indicator that the engine is seizing as many strokers know.[/list]
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nearly a normal tax paying tosser.......with ferrileness suzi100,cg125,cb125scb100n,cb175,cd100,cj250t,kh250,c15,125 bantam,super 6,rickman gs750,xt500,250rs,dt175,lifan125,dolomite1850,metro,Morris220ld,morrisfg,leyland princess,range rover,corsa,vw camper .now struggling with legs. MORE ORDER = MORE CHAOS

[Rogerborg]

[P.]

Air/Oil cooled V twin engine

Pop your front spark plug out, its a bitch of a job, but see what colour it is.

I never had issues with my Hyo over long distance, but it was very low mileage! The engines start getting shit after about 15,000

[temeluchus]

Hyosung is a Korean company. They make their own bikes and are also contractors to Suzuki and make a fair few of their small bikes.

The GV125 is a OHC Vtwin and bares no relation to the CG125.

I'd start by checking the plugs after it conks out to see what they look like, could be stuck choke or a blocked air filter.
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Some shite cruiser. Now with guns and FREEDOM!

[N cee thirty]

[unitynotsocri...]

Yeah its all chinesesy crap,your right .Its the oversize v twin,either way you've probably got a serious need for a new piston and rings,hopefully not x 2 .Buy a cg clone ,it may be cheaper than fixing a blown engine.
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nearly a normal tax paying tosser.......with ferrileness suzi100,cg125,cb125scb100n,cb175,cd100,cj250t,kh250,c15,125 bantam,super 6,rickman gs750,xt500,250rs,dt175,lifan125,dolomite1850,metro,Morris220ld,morrisfg,leyland princess,range rover,corsa,vw camper .now struggling with legs. MORE ORDER = MORE CHAOS

[P.]

[temeluchus]

[unitynotsocri...]

It might be cheaper to buy a cg clone (complete bike) and use that.
Korean,chinese,whatever.i was brought up as a kid in Malaya and they're all the same to me.
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nearly a normal tax paying tosser.......with ferrileness suzi100,cg125,cb125scb100n,cb175,cd100,cj250t,kh250,c15,125 bantam,super 6,rickman gs750,xt500,250rs,dt175,lifan125,dolomite1850,metro,Morris220ld,morrisfg,leyland princess,range rover,corsa,vw camper .now struggling with legs. MORE ORDER = MORE CHAOS

[fireyphoenix1...]

except all the hyosungs i seen are well built and south korea is about a decade ahead of us in terms of economy and technology reason their bikes development is so slow is theres not a huge demand for them in country as the south korean public transport system is so good ....i know a guy who has the comit 125 32000 miles no problems tho i wouldnt mind owning it myself infinatly better that the chinese bike i have atm lol at the hyosungs all use propper tyre sizes non of the 18 / 1.75 bs that all us cg / cgclone en cbr .....125 owners have to endure
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2014 Aprillia dorsoduro 750 factory.

[adamck]

+1 ive had 2 Hyo's and still ride one now.
No problems at all (other than the usual carb tinkering and consumables).

Sounds to me like its running on 1 cylinder, check your main jets in the carbs. they can get shit in them sometimes.

If it gets to 1 cylinder it will seriously drop in power and wont idle at all, happened to me in the past, sometimes leathering it through a few gears at high revs shifted it and it started firing on both again.
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[Fairies attack]

It's either:
Fuel-
Could be dirt in the carbs, blocking the jets. Take the float bowls off take the jets out and give them a clean.

There was a problem with the tank not venting a few years ago, this is easily diagnosed by running the bike until it starts to die, and then killing the power and opening the tank and listening for it sucking.

Check the inline fuel filter, there has been problem of some of them melting internally, and blocking the fuel line.

Electrical-
Check the coil packs, some people have had problems with them, after the alternator was buggering about and not charging properly, then it frying some other stuff.

Check the HT leads and caps.

Mechanical-
I really do doubt it could be anything mechanical, that has been caused during manufacture. They sorted out the problems that every retard thinks makes them shit, in the 06-07 models. And that was the front cylinder hardening the valves then, snapping them and causing internal detonation.

I would suggest dropping the oil though, because if it has been pre-owned then it is more than likely something that the previous own has done to it.

I'm not sure if it was just the GV650 that had a small batch of them go out with dodgy cam tensioners. But they were all recalled and sorted out.

Hyosung are coming along rather nicely in the bike market, to say UM and Fischer are struggling, and they actually sell Hyo's under a different name says a lot.

When I got my GT650r getting parts was a complete and utter PITA but that is more the problem of the importer (Barus) who refuse to have anything to do with them, or even have the name on the side of one of the race bikes.
If people think that they are slow and unreliable POS then I would suggest they go look at these:
https://korider.com/index.php?topic=18892.0
https://korider.com/index.php?topic=17398.0
People are racing them, and successfully winning.

The only let down from Hyo is the fact that people are still ignorant enough to think that they are Chinese, and pass judgement on them without looking, or having a ride on one.

[unitynotsocri...]

cured of my ignorance,although they (125)look a bit heavy.
thanks to BCF members,
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nearly a normal tax paying tosser.......with ferrileness suzi100,cg125,cb125scb100n,cb175,cd100,cj250t,kh250,c15,125 bantam,super 6,rickman gs750,xt500,250rs,dt175,lifan125,dolomite1850,metro,Morris220ld,morrisfg,leyland princess,range rover,corsa,vw camper .now struggling with legs. MORE ORDER = MORE CHAOS