Reply To: Hyosung 125cc gv running slow when warm
What battery do you have ?
Commonly it’s the regulator that fails and is the mother of the bike’s electrical system.
Switch on the bike. Switch your meter to DC Volts. Rev up to 2000 – 3500 rpm
You should see 14.6v at least. The books for the GV engine state norminal running rate is 14 – 16v max.
Any 13v readings? The regulator is probably gone.
HT leads normally are ok & it’s insulator – Usually it’s the black coil itself, that goes out too. If you ask me, Coils & regulators are usually the biggest let downs on electrical side.
As for your fueling side. A good carb clean is handy always. I am going to publish an article that shows step-by-step Jet Swapping & some extra info for owners looking to self-maintain their carbs.