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Fitting new coils and leads fixed this. There was oxidisation behind the split sleeves. No loss of power now and the throttle response is smoother and immediate, unlike OEM parts. Thanks for the help @M77
Mar 25, 2026 at 11:32 PM in reply to: Sparking Issues / Rough Idle on GV125-S Aquila [SOLVED] #22155I will wait for rubbers to arrive and go from there. Will update asap
<p style=”text-align: center;”>Both boots split. What do you reckon, Marcel; this is surely the cause of my problem, no?</p>

Plunger looks to be ok. I ordered coil packs, leads, and plugs last night, so I’ll see if they fix the issue before checking anything else.
wI’ll try one of your honda replacements if you need me to test. What’s the best way of getting payment to you?
i think i may have found a replacement. It’s meant to be for Lexmoto. Looks exactly the same 
Please let me know if you source spares. I’ve only seen hyospares but I’m aware that they’re scammers
We got you , just keep an eye on shop , or send an email if you don’t see the part you want and I will verify if we had any luck in the supply chain. I will try though!
<p style=”text-align: center;”>Clutch switch is at fault. I have it bypassed temporarily. Do you know where i can source a new unit?</p>Please let me know if you source spares. I’ve only seen hyospares but I’m aware that they’re scammers
Rolled her downhill in 2nd gear.
I’ll keep looking.
Stand Switch would be #1 and then replacing the Clutch Switch (would not bypass it) as if the ECU thinks you’re holding the clutch all the time , it might get funny as I can’t fully confirm how much Hyosung has programmed their ECU to depend on user actions (rather than bypasses) If you said GV125 carb model = it would not matter as Hyosung didn’t always include stand switches or clutch switches , they didn’t matter too much. Also in my experience one of my bikes was in NEUTRAL (according to the dash) and i pushed start , it rolled and fell down , so false neutrals are rare and can happen , hence “hold clutch in” before starting is enforced on these 2018+ new models of bikes coming out now. Neutral Switch , complicated as it is also a gear counter, so i would not mess with it. ECU may read what gear you’re in to optimize ignition behavior etc
I got her bumpstarted. Does this mean that the safety switches haven’t failed?
Stand Switch would be #1 and then replacing the Clutch Switch (would not bypass it) as if the ECU thinks you’re holding the clutch all the time , it might get funny as I can’t fully confirm how much Hyosung has programmed their ECU to depend on user actions (rather than bypasses) If you said GV125 carb model = it would not matter as Hyosung didn’t always include stand switches or clutch switches , they didn’t matter too much. Also in my experience one of my bikes was in NEUTRAL (according to the dash) and i pushed start , it rolled and fell down , so false neutrals are rare and can happen , hence “hold clutch in” before starting is enforced on these 2018+ new models of bikes coming out now. Neutral Switch , complicated as it is also a gear counter, so i would not mess with it. ECU may read what gear you’re in to optimize ignition behavior etc
Appreciate it. Had a look for a replacement switch but couldn’t find anything. Sourcing parts for this bike is hard
Clutch Switch , Neutral Sensor , RO Sensor (Roll Over Sensor) , Magneto Pulse Trigger (part of the stator unit)
Thanks, Marcel. Where would you start if the sidestand switch has been cleaned and still isn’t working? I’ve had this problem before and it was as easy as blasting the sidestand switch with brake cleaner.
Mine have a small indent on the side where orange meets black to pop the orange cover off.
All OEM. I will do the tests asap. Working stupid hours atm
I’ve ordered some formula gold. E5 all the way with this bike.
I haven’t checked plugs or anything else but will do on my day off. Does the O-ring physically deform? I drove to work this morning, and oddly, eveything was normal! I went to redline in every gear multiple times so I’m not sure why tf it was playing up last night.
Marcel, can you offer any advice?
May be a failed master cylinder
Does the rear reservoir have fluid in it?
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