Reply To: Hyosung GT125R Carb Carburetor problem
Hello . I checked spark plugs. they all give the same spark. it’s not the spark’s fault.for the rear cylinder to start working. must choke to max . and I have a question if when we give choke . throttle is closed or very slightly open ? . and unfortunately . when I can make it work on both cylinders. I twist air mixture screw . nothing happens .
Now it makes sense , it sounds you definitely need the carbs removed
- Have them ultrasonic cleaned first (as it has many holes inside)
- Check to make sure pilots are size 15 each
- Set mixture to 2.5 full turns out, (Never ever touch this screw again, no matter the issues), this is close to Korea set up of 2.5 front / 2.75 rear
- Main Jets should be 87.5 front and 90 rear if bike is completely stock or 90 front or 92.5 if it has any exhaust mods (any)
- Set the slide need to rich mode
- Make sure float height is 7mm.
If in doubt, replace floats and also replace the gold float seats and float needle on the bike from a rebuild kit. It will thank you for it.
For carb jetting , slide mode , see tutorials in the “TutoriaL” section of this forum 🙂