My bike is having issues. When I throttle and release the clutch it hesitates a lot. All gears it’s the same issue. Changed plugs, air filter, ran some Heet in the tank. Any advice would be appreciated

 

2008 C50T sputtering through a specific rpm range. clears up above and below that rpm range. I don't have a tach, but I'd guess around 1600-1800 rpm. I changed plugs, ran Seafoam through it. No improvement. did you sort your issue out?