Alright im not sure what the problem is with it. it could be jetting but im not sure it runs fine but it almost acts like u can give it too much throttle. if u just crack it back it bogs out but if u ease into the throttle it will go good as long as u dont take it too far back, even running top end if u open the throttle all the way it still bogs. also if u get it revved to high the engine starts making like a pinging sound. probably main jet? but the plug looks good after a ride. i need this thing running right so i can sell it QUICK! need some money for shee mods