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Thomas replied to the topic Midrange lack of power GT125R in the forum π§ Hyosung Technical Help 8 months ago
Right, had to nip out to the shop and I’ve noticed another 2 issues.
My indicator relay is buzzing like crazy when indicators are off. Stops buzzing when indicators are on.
And my neutral light is flickering in at low rpm when riding in gear. Goes off when revs rise above 4k.
I think there is deffo voltage leaking through the system…[Read more]
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Thomas replied to the topic Midrange lack of power GT125R in the forum π§ Hyosung Technical Help 8 months ago
Hi Marcel
Thanks for your replies
Unfortunately the weather has been crap today so not had chance to take her out and warm her up and get the stator resistance readings.
When the weather is a little better I’ll warm her up. Take her for a 10 min ride then I’ll redo to stator check and I’ll remove the plugs and send updated pictures of…[Read more]
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Thomas replied to the topic Midrange lack of power GT125R in the forum π§ Hyosung Technical Help 8 months ago
Hey Marcel
I’ll do a resistance check in the stator tomorrow with the bike fully warmed up.
- Battery is a yuasa ytx 14 BS, not sure on age. Haven’t had it checked either but will get it done at halfords asap
- Headlights are stock bulbs a year old as I replaced them not long after I got the bike
- There are no electrical accessories on the…
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Thomas replied to the topic Midrange lack of power GT125R in the forum π§ Hyosung Technical Help 8 months ago
I’ve attached a photo of the potting on my reg/rec bulging out. All but one of the phases into the reg are fried. Noticed the issue when the bike stopped charging past 5k rpm. Tested and confirmed with a multimeter the unit is fried. I’m at a loss what’s causing my issues
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Thomas replied to the topic Midrange lack of power GT125R in the forum π§ Hyosung Technical Help 8 months ago
Okay double checked and all 3 phases measure 0.8 ohms, so maybe this isn’t my problem.
Voltage of the phases at 4k rpm all sit at 65v AC.
A bit late to rev it to 5k, neighbours won’t be happy.
Any insight would be helpful right now as the bike has eaten 2 coils and and regulator/rectifier that cost me a lot of money. I need to get to the…[Read more]
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Thomas replied to the topic Midrange lack of power GT125R in the forum π§ Hyosung Technical Help 8 months ago
Okay I’ve just looked at the specs for the charging coils and the manual says between 0.6-0.9 ohms. So might be In spec then. I’m gonna retest
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Thomas replied to the topic Midrange lack of power GT125R in the forum π§ Hyosung Technical Help 8 months ago
Hi Marcel.
Sorry for the delay between posts. Long story here so I’ll try to be quick.
You know I emailed you about my uprated coils failing, well the uprated reg/rec has just died too. I’ve just tested the 3 yellow wires from the stator and they are all directly shorted to each other. Less than 1ohm resistance between all 3 phases.
So I…[Read more]
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Thomas replied to the topic Midrange lack of power GT125R in the forum π§ Hyosung Technical Help 10 months ago
Hi Marcel
To be honest the threads on the plug being wet may be due to the fact the sparkplug wasn’t tight when I swapped them out earlier today. I’ll post pics.of the new plugs once my clamps and carb screws arrive as I’ll have to strip her back down then anyway. I’ve put 30 miles in the new plugs and caps today and the bike already feels…[Read more]
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Thomas replied to the topic Midrange lack of power GT125R in the forum π§ Hyosung Technical Help 10 months ago
Top Hi sorry itβs been so long. Today I finally changed my spark plugs and caps and the machine instantly feels better. Still have the issues with it cutting out when leaning into the side stand but pretty sure thatβs float heights slightly out of whack. Iβve got pictures of the plugs from the machine as requested and are posted below. Let me kn…[Read more]
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Thomas replied to the topic Midrange lack of power GT125R in the forum π§ Hyosung Technical Help 10 months ago
Hi sorry it’s been so long. Today I finally changed my spark plugs and caps and the machine instantly feels better. Still have the issues with it cutting out when leaning into the side stand but pretty sure that’s float heights slightly out of whack.
I’ve got pictures of the plugs from the machine as requested and are posted below. Let me know…[Read more]
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Thomas replied to the topic Midrange lack of power GT125R in the forum π§ Hyosung Technical Help 11 months ago
I’d live to bring it in but I can’t get it through our door haha. I keep her covered outside and coated with acf 50 so she should be okay. I’m an all year round rider as she is my daily driver. I always leave her to warm up for 10 mins though..she doesn’t like the cold too much haha
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Thomas replied to the topic Midrange lack of power GT125R in the forum π§ Hyosung Technical Help 11 months ago
Thanks Marcel. I’ll get some new plugs too as I think it’s due..I still haven’t had chance to pull mine so I can get pics from you but I will do it soon. Just had a whirlwind weekend. Think I may take the carbs off anyway and double check the float heights just to be safe too.
Bad time of year to be working on bikes as I have no garage so have…[Read more]
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Thomas replied to the topic Midrange lack of power GT125R in the forum π§ Hyosung Technical Help 11 months ago
Hi Marcel
I haven’t had chance yet. I’ll try tomorrow. I’m gigging tonight so spent all day prepping for that haha but I’ll get them posted asap.
I do get a misfire when the engine is warm so I will invest in some caps either way. I’m using stock plugs at the moment.
Thanks for the reply matey
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Thomas replied to the topic Midrange lack of power GT125R in the forum π§ Hyosung Technical Help 11 months ago
I do get weird behaviour when changing hear sometimes too. Like the engine lags before coming back to correct RPM. And the bike jerks a little.
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Thomas replied to the topic Midrange lack of power GT125R in the forum π§ Hyosung Technical Help 11 months ago
Thanks for the replies everyone. I can confirm the needle slides are on the “rich” setting. Before I did this the bike was pretty much unrideable in the mid range.
Only mods are the ones listed above and a bolt on exhaust can. (Bike had this when I purchased it)
I’ve also deleted the AIS. I have made sure that the pipe that used to go to the AIS…[Read more]
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Thomas replied to the topic Midrange lack of power GT125R in the forum π§ Hyosung Technical Help 11 months ago
Also wanted to add I have purchased the updated reg/rectifier too and confirmed the batter is good. Bike puts out just over 14voltdnat tick over and about 14.2 at 5k rpm
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Thomas started the topic Midrange lack of power GT125R in the forum π§ Hyosung Technical Help 11 months ago
Hi all,
I have a 2015 GT125r and it’s a lovely machine. However I am running into a lack of power between 6-9k rpm.
Things I have checked:
Compression shows as 145 on each cylinder, tested hot
New coils from store on here
New Intake O rings from store on here
Carbs upjetted to 90&92.5
New vacuum hoses purchased from store on here
New…[Read more]
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Thomas became a registered member 1 year ago