2001 Hyosung Sense 2T Issues

[Firehawk989]

Hi all,

So I bought this 2001 Hyosung sense that had been sitting for 2 years. Replaced the spark plug, drained the old gas and replaced with new 94 octane ethanol free, removed/cleaned the carb bowl and sprayed out the jets with carb cleaner. I got it to run, but it does not run well at full throttle. It runs fine until it warms up, but then starts to sputter/backfire at full throttle and starts to smoke a fair bit when warm. Idles fine and runs ok at mid throttle, just full throttle is the problem.

I didn't disassemble the carb other than taking off the bowl, and there was definitely varnish/crud in the bowl when I removed it for cleaning. Should I pull the jets out and check them properly?

I'm thinking carb problem or maybe reeds, what do you guys think?