Forums 🚥 PiT STOP 🔧 Hyosung Technical Help Found the reason for over fuelling! – GT125R Carb Issues
- This topic has 6 replies, 2 voices, and was last updated 7 months ago by
♠️ MARCEL.
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Oct 13, 2024 at 3:30 PM #15182
So I found that the previous owner of this Hyosung gt15r had put in jets that where 122!!! I have replaced them now with rear 92.5 and 90 front. They have also messed with the mixture screws as the plugs still foul. Does anyone know where they roughly should be set? Thank you everyone in advance!
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Oct 13, 2024 at 10:36 PM #15191
the last keeper is a moron! 122 ? wow not even a 300cc will run well with that jet size, that’s almost 650cc teritorry!
The factory mixtures is around 3 turns front and 3.5 turns rear , though 2.5F / 2/75R is OK.
// Meditation doesn't mean you have to sit still....
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Oct 14, 2024 at 8:20 AM #15193
Thanks for all your help, unfortunately, the bike has lost compression, in front cylinder. Seems it had been abused to much. Now looking for a new engine.
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Oct 14, 2024 at 10:25 AM #15195
Do you want to check ebay for used cylinders and pistons ? I have loads there worth a rebuild to try!
I will get a cylinder “head” (valves) soon , listed up there but im sure your valves are okay , if they need rebuilding , the first thing is usually the valve seats that drip out oil in to plugs
Don’t forget you need engine gaskets too (can’t re-use old ones)
// Meditation doesn't mean you have to sit still....
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Oct 15, 2024 at 10:53 AM #15201
Where di i get the gaskets from? Trying to locate them
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Oct 15, 2024 at 11:22 AM #15202
And i bought one of your pistons i think from ebay
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Oct 15, 2024 at 3:50 PM #15203
We have gaskets in the shop, see link below: (if you need a gasket that isn’t mentioned on the shop, send us an email at the bottom of the website)
https://hyoriders.club/shop/PS. Thanks for your order, piston was sent today.
// Meditation doesn't mean you have to sit still....
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