Reply To: Hyosung GV650 2013 Model struggles after exactly 20 minutes of riding every day
Heat generally is the enemy of electronics , have a look at your coils and caps.
The plugs will tell you if your injectors are doing OK or the ignition parts (coil , caps are going funny – caps more likely than a coil but both can take each other out)
Fuel Pump = Open the tank when you get free time , drain fuel and inspect the strainer of your fuel pump , hopefully it doesnt scream “needs replacing” incase the pump is not drawing as much fuel as efficient due to a clogged sponge (strainer/filter)
In your country, get this bottle (or similar) but avoid REDEX please:
Pour 2x bottles in the tank (all of it) , ride with 1/2 of normal petrol in the tank , what we want to do here is see if the cleaner will do its job from the pump, injectors, fuel lines , etc and report back to see if the mood has changed ?
Slow Riding = Check your thermostat,  it might not be opening/closing properly or not at all , and depending how old the coolant is,  flush the system and replace with Motul Factory Line coolant (my personal favourite) , as Hyosungs generally like motul products.
If it is due for oil change, try Motul 7100 (Best oil for hot twins)
Notice I did not give a specific answer , as if i said thermostat , i could be wrong when the bike was screaming about a faulty ignition coil, so its better to do a process of elimination.