I'd go back in the carb and see if there is something in a jet. Might as well start simple.
Got compression (piston bad) ?
Spark plug cap?
Spark plug not firing correctly under compression?
The rollers all melted?
there's a few things to consider.
2000 GNC 5N\
2001 GNC 9N \ 40+ class
2004 GNC 9N /
2014 rock crusher "GO tortoise GO!"
2016 Byrd Rooster
Father of the "11" time National champion,and worlds fastest woman ATV racer
A few fast LT80's
250R~300cc's
300ex
350 Rancher
Kymco Mongoose
Survivor of the 12 Hours of ATV America 04 and 05