Hi from Belgium
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Bike Model = : Aquila GV125S Bobber EFI
Hi everyone!! Nice to have finally found a place to talk about my bike with people who have the same one.
My name is Aurélie, I’m 33 years old and live in Belgium. I’ve not been riding long, only since last september (2025). I love my Aquila gv125s, it’s such a fun bike for such a small displacement. Initially I thought I’d only drive it for a bit until I got my proper A license, but I really fell in love with it.
I’m very interested in customizing and tuning, although not experienced at all. I’d love to tinker with my bike and do some upgrades and customizations. I’ve already been eyeing the 520 chain and sprocket upgrade everyone seems to be raving here about. As well as a potential ECU flash, although that seems a bit more complicated (anyone have experience with those?).
Anyway, nice to meet you all and happy to be here!
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Welcome! Hope to see the completed upgrades you will post on the forum 🙂
Not many people do ECU flashes as they are afraid that a false move could mean they can’t get a replacement ECU , however , they try to improve the sparking a little bit , the most improved mods would be something like a 520 chain set and a good clutch upgrade for long summer trips.
If you have OEM caps, replace them with NGK ones , that’s the only major electrical complaint people have in the UK , sometimes the stock caps ruin the coils next. And invest in a good regulator! That’s pretty much it.
You could at your own pace upgrade the tyres too, so its less suicidal when riding in the rain, i was never a fan of the stock Tyres Hyosung used in the past. #
I believe once you go 520, you won’t go back to the tiny chain 🙂
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Welcome! Hope to see the completed upgrades you will post on the forum 🙂 Not many people do ECU flashes as they are afraid that a false move could mean they can’t get a replacement ECU , however , they try to improve the sparking a little bit , the most improved mods would be something like a 520 chain set and a good clutch upgrade for long summer trips. If you have OEM caps, replace them with NGK ones , that’s the only major electrical complaint people have in the UK , sometimes the stock caps ruin the coils next. And invest in a good regulator! That’s pretty much it. You could at your own pace upgrade the tyres too, so its less suicidal when riding in the rain, i was never a fan of the stock Tyres Hyosung used in the past. # I believe once you go 520, you won’t go back to the tiny chain 🙂
Omg thanks for the advice! Yeah an ecu flash is not something I’d do willy-nilly and especially not without first finding someone with experience with those kind of things to help me.
520 chain first, then probably clutch. When you say caps, what do you mean? I’m not used to all the jargon in English yet 😅
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Hello!
I’d stay away from ECU flashes and such, doing things like that tend to come with their own problems sadly if it aint broke don’t try fix it ;).
The chain is a must, you wouldn’t go back I had to washer up my left hanger bracket but I doubt you’ll have this problem on a GV.
Just out of interest what tyres are on it? If it’s the Shinkos (I doubt it being that old) please get rid! Might be worth looking for a front fender extender too if they do one for yours :).
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NGK Caps (Spark Plug HT Leads) , sorry!
okay! no worries haha, thanks for clarifiying
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Hello! I’d stay away from ECU flashes and such, doing things like that tend to come with their own problems sadly if it aint broke don’t try fix it ;). The chain is a must, you wouldn’t go back I had to washer up my left hanger bracket but I doubt you’ll have this problem on a GV. Just out of interest what tyres are on it? If it’s the Shinkos (I doubt it being that old) please get rid! Might be worth looking for a front fender extender too if they do one for yours :).
Oh okay, yeah an ecu flash seems super risky indeed, I was only thinking about it cause a friend of mine recently flashed their Honda Monkey 125 with pretty cool results (noticably faster accelleration and higher top speed). But I think with the chain, clutch, and possibly spark plug upgrades I’ll be fine until I graduate to a larger displacement.
I bought my gv125s secondhand but I’m pretty sure it’s still the stock tyres on there. I’ll take a picture tomorrow and post it here so people can check.
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Hello! I’d stay away from ECU flashes and such, doing things like that tend to come with their own problems sadly if it aint broke don’t try fix it ;). The chain is a must, you wouldn’t go back I had to washer up my left hanger bracket but I doubt you’ll have this problem on a GV. Just out of interest what tyres are on it? If it’s the Shinkos (I doubt it being that old) please get rid! Might be worth looking for a front fender extender too if they do one for yours :).
Oh okay, yeah an ecu flash seems super risky indeed, I was only thinking about it cause a friend of mine recently flashed their Honda Monkey 125 with pretty cool results (noticably faster accelleration and higher top speed). But I think with the chain, clutch, and possibly spark plug upgrades I’ll be fine until I graduate to a larger displacement. I bought my gv125s secondhand but I’m pretty sure it’s still the stock tyres on there. I’ll take a picture tomorrow and post it here so people can check.
Is something happening with your clutch? does it need it?
Spark plug upgrades and stuff would be wicked for you! I would genuinely not bother installing a new clutch unless it’s properly fully gone it isn’t worth the time paying someone to do it unless you need to.
How many miles are on your speedo? has it done much?
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Hello! I’d stay away from ECU flashes and such, doing things like that tend to come with their own problems sadly if it aint broke don’t try fix it ;). The chain is a must, you wouldn’t go back I had to washer up my left hanger bracket but I doubt you’ll have this problem on a GV. Just out of interest what tyres are on it? If it’s the Shinkos (I doubt it being that old) please get rid! Might be worth looking for a front fender extender too if they do one for yours :).
Oh okay, yeah an ecu flash seems super risky indeed, I was only thinking about it cause a friend of mine recently flashed their Honda Monkey 125 with pretty cool results (noticably faster accelleration and higher top speed). But I think with the chain, clutch, and possibly spark plug upgrades I’ll be fine until I graduate to a larger displacement. I bought my gv125s secondhand but I’m pretty sure it’s still the stock tyres on there. I’ll take a picture tomorrow and post it here so people can check.
Is something happening with your clutch? does it need it? Spark plug upgrades and stuff would be wicked for you! I would genuinely not bother installing a new clutch unless it’s properly fully gone it isn’t worth the time paying someone to do it unless you need to. How many miles are on your speedo? has it done much?
ah no I don’t think anything is wrong with the clutch per sé but I read people here saying it was one of the things most worth upgrading after the chain. You think it’s not necessary? Probably best to do the spark plugs and caps first then?
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Hyosung uses china springs & china plates on the latest GV125-S EFi (to save costs) , so they are prone to slippage sometimes, if you were to switch to EBC UK springs & EBC plates they definitely help the basket last a bit longer since the GV EFi will probably carry luggage etc (being a cruiser etc) , you want the stronger springs to bite harder , you will notice it more when changing gears with Motul 7100 oil (great Ester oil)
If you ever dare change the exhaust, use the OEM Harley one, as other ones will loose power on the GV-S (Historically, GV Aquilas were always slower than their GT sisters, and using slash cut cans make them worse) , it would make your other upgrades pointless , so best cans so far are “OEM Hyosung” yes the ugly one or the Harley OEM one (it;s stock but slimmer and is almost OK enough not to loose too much backpressure as vtwins start their power in lower revs than screaming i4/i1 bikes.)
See here: https://hyoriders.club/forums/topic/exhaust-suggestion/
@Tom in that topic has posted a youtube link and name of the HD exhaust (HD = harley davidson)Stay away from knock off Temu exhausts lol, china doesnt care
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Hi everyone!! Nice to have finally found a place to talk about my bike with people who have the same one. My name is Aurélie, I’m 33 years old and live in Belgium. I’ve not been riding long, only since last september (2025). I love my Aquila gv125s, it’s such a fun bike for such a small displacement. Initially I thought I’d only drive it for a bit until I got my proper A license, but I really fell in love with it. I’m very interested in customizing and tuning, although not experienced at all. I’d love to tinker with my bike and do some upgrades and customizations. I’ve already been eyeing the 520 chain and sprocket upgrade everyone seems to be raving here about. As well as a potential ECU flash, although that seems a bit more complicated (anyone have experience with those?). Anyway, nice to meet you all and happy to be here!
Welcome 🙂 Same path as you, first bike in september 2025 but in my case it was the GT250R, welcome to the hyo life!
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