My son and I were out riding the other day, I was following behind him and his 04 Preditor 90 started to backfire, We took him back to the truck and changed spark plugs which resolved the backfire, However, after it started to backfire & for a few minutes after we changed the plug the throttle was SUPER sensitive, you would barely touch the throttle and that bike would take off, I jumped on it to test it after I changed the plug and was able to spin the tires pretty easily in the dirt and Im 200lbs. Shortly after my son got back on, it was back to normal.
Anyone ever heard of this before? I have the throttle jumper off and the throttle limiter screw about half way out.
The throttle was great for the few moments it was Super sensitive, How can I get that back?

 

Myself i dont know how to keep the it super sensitive but i am sure someone in the kids and other atvs would give you some advise Click Here

 

Remove the throttle screw and let it clean out. see if that helps.