Newbie Hyosung owner
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Hi all,
Just signed up to the site and thought id introduce myself.
Bought a Hyosung GT125 RC last week and like it a lot. Bought it for 2 reasons, 1 being its size (im 6ft) and the second reason because it has a V twin engine.
People don’t believe me when i tell them it’s only a 125.
Its done just over 8k on a 2017 plate and is totally standard 2 owner bike in red and grey.
I’m sure i will be asking some questions on here as it already had one glitch on its first outing which confused me but apart from that its a good looking bike.
Cheers,
John.
PS,
Sorry if its in wrong place.
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Hi John, Welcome to the site. Glad you like the bike and hope she gives you a lot of pleasure. I bought the same model new in 2019 and still enjoy every ride. With good maintenance and care i’m sure you’ll enjoy many happy miles on her. You didn’t mention what the glitch was though?
All the best, Dave.
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Hi Dave,
Thanks for the welcome 🙂
Yeah sorry, was going to post about the glitch in another thread but seeing as you asked, here goes.
So first time out, going up a duel carriageway at 70 mph for about 5 mins and had a loss of power. It was just like it ran out of fuel so i tried to keep it going in gear clutch out but speed was dropping, dropping down the gears in the hope it would wake up but speed still dropping so i moved to my left which is like a tiny hard shoulder section to get off the main carriageway and now im doing 22 mph then it gradually picked up speed as normal and was fine for the remainder of the 60 mile trip.
Now my initial thoughts were a fueling issue because the guy i bought the bike from only had it 4 months and it came with 3/4 of a tank but i have a feeling it might be E10. The bike is a bit sluggish so gear changes are around the 9 – 10k mark and it has this weird flat spot when you roll off the throttle and roll back on.
I have a receipt for the bike being serviced in March this year but i have read all about the bigger jets, coils, plugs etc etc so think this is the route i shall take but failing that a nice 250 motor i understand will go straight in LOL
Other thing i dont like is the harshness of the front suspension but with that said it still has its original tyres on it and i noticed some cracking between the treads however the tyre rubber still feels soft. While on the subject of tyres, is there any reason why my bike is a 2017 but the dates on the tyres are 2015 but no mention on the logbook saying its an import?
Sorry to rattle on but thanks in advance for any info.
Thanks,
John.
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Hi again John, What a coincidence my bike has done exactly the same thing twice recently! She only did it after a spell of 60
-70 mph running. If it helps my bike has upgraded coils, plugs and caps and a pipe and has only ever been run on super unleaded from bp so cheap super market fuel not to blame. I also use liquimoly carb cleaner every third tankful. I have the flatspot on the overrun too. My guess is a vapour lock or something similar and i may replace the fuel filter. I gather 2015 was the last year the model was produced so that would explain the tyres as many bikes were not sold till much later(mine is 2019 reg) and I noticed cracks so changed them as the originals are lethal in the wet! Apart from longer higher speed runs recently mine performs perfectly and three years on I still love it. Just to add I did a 50 mile higher speed run last weekend and the bike was faultless!
Hope this helps, Dave.
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Hi Dave, sorry for late reply but thanks for the info.
Did the same trip on the bike yesterday with no issues so a bit weird other than what you mentioned about an air lock maybe.
I also noticed when starting the bike it has instant throttle response then after about 10 seconds its like its flat then yesterday i reved it a couple of times and it was fine all evening. Really strange so i have decided il give it a full service, change all filters and plugs etc and see how it goes.
One other thing i noticed is the exhaust can is a bronze colour like its heat tarnished rather than a silver, is this normal for these bikes?
Thanks, John.
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Hi John, When you start the bike do you use full choke as mine needs it to start even in warm weather(and for the first couple of miles). My exhaust started to colour up too but I changed it for an end can so I can’t say what would happen after a few months, I think that’s normal. My bike has run great for the last couple of rides with no more losing power episodes so I haven’t tried anything else yet. Maybe Marcel or other more experienced owners may have some thoughts on what causes these? All the best, Dave.
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Lack of snappy throttle can just mean the carb needs a nice ultrasonic clean once in a while, it really pays off and at least you can find out if the previous did anything suspicious like putting the wrong jets inside which makes a bike a little too rich when its hot. Fortunately, this site has various carb tutorials for carb tune ups. But before you or anyone attempts to open the carbs, please get fresh screws from the shop and discard the old ones. Never reuse old carb screws.
Also as it s JAPAN carb, use a Jap screwdriver called “JIS” screwdriver, cause UK drivers will instantly round off the heads. Incase you or your mechanic not aware.Plugs, are always an easy replacement, stock ones work okay, but age or mileage (whichever is first) will make them wane, new ones go a long way.
If you look under the bike and you have silver colored pipes, then you have stainless pipes from Black Widow UK , or Scorpion , or MTC (rare) or MotoUnion (too rare, out of business) or even TK ones , they will discolour a bit with heat. It is normal.
Hope you enjoying the bike, post the in Tech section if anything comes up.
If not, share a picture of her here;
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Hi John, When you start the bike do you use full choke as mine needs it to start even in warm weather(and for the first couple of miles). My exhaust started to colour up too but I changed it for an end can so I can’t say what would happen after a few months, I think that’s normal. My bike has run great for the last couple of rides with no more losing power episodes so I haven’t tried anything else yet. Maybe Marcel or other more experienced owners may have some thoughts on what causes these? All the best, Dave.
Hi Dave,
Some times it needs 3/4 choke and sometimes when sat outside in the sun all day it starts with no choke at all. Choke doesnt seem to alter much tbh. One cool morning it was being hesitant with full, half or quarter choke but once i got going and it warmed up a little it was ok. Over the last couple of days while it has been so warm the bike has performed really well so far. Im a bit hesitant to strip the bike while the weather is so nice while i can use it so il shall keep rolling the dice 😆
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Lack of snappy throttle can just mean the carb needs a nice ultrasonic clean once in a while, it really pays off and at least you can find out if the previous did anything suspicious like putting the wrong jets inside which makes a bike a little too rich when its hot. Fortunately, this site has various carb tutorials for carb tune ups. But before you or anyone attempts to open the carbs, please get fresh screws from the shop and discard the old ones. Never reuse old carb screws. Also as it s JAPAN carb, use a Jap screwdriver called “JIS” screwdriver, cause UK drivers will instantly round off the heads. Incase you or your mechanic not aware. Plugs, are always an easy replacement, stock ones work okay, but age or mileage (whichever is first) will make them wane, new ones go a long way. If you look under the bike and you have silver colored pipes, then you have stainless pipes from Black Widow UK , or Scorpion , or MTC (rare) or MotoUnion (too rare, out of business) or even TK ones , they will discolour a bit with heat. It is normal. Hope you enjoying the bike, post the in Tech section if anything comes up. If not, share a picture of her here;
Hi Marcel,
Thank you so much for the info as i wasn’t aware japs had different philips heads to us so i shall have a look for the correct driver.
The exhaust is the standard black one with the standard can on it. I would like a SS system on it just to let the engine breath a bit easier and to unleash that nice V twin sound.
Will get a pic posted of the bike asap.
Thanks,
John.
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