Reply To: Need help with hyosung GT125 P
I am happy you made some progress with it my fellow yorkshire man.
Do you have carb cleaner still left ? – Look at the tutorial on this forum for “Carb jet” , just follow the instructions on how best to fit the carb and airbox together etc . Then put the air filter back in.
Set the idle screw high (to about 2k revs) , then remove choke and accelerator cables off the carb while it runs.
Now reduce the idle screw to 1500 rpm.
Does the RPM needle bounce up and down (like its starving for fuel)
or
using your hand , twist the throttle at the side of the carb , and see if the revs go down fast on the dash, if the revs a very slow to climb down to 1500 rpm and settle in.
You may be looking at sooty plugs or plugs breaking down (inconsistent spark power)
or
Take your carb cleaner out as i said earlier in this reply , spray the manifolds, spray under the manifold gaps where orings sit , spray under the airbox where carb swallows the box
Do 1 step at a time and make sure to really listen for any engine sound changes , usually if you spray somewhere the revs go up or bike shuts off = indicating that particular spot you sprayed is leaking air (& subsequent vaccum loss to draw fuel out of the carb)
Since its a CV carb = it implies constant velocity (Constant Velocity) , it is not able to tolerate even a minor air leak or an airbox missing, it just runs rough.
The inlet manifolds will still last long as you will make sure they do not split up , and keep using E5 fuel forever. E10 will rot it.
// Meditation doesn't mean you have to sit still....
