I traded my non running dirt bike for a non running ATV. I cant seem to get it to work. I took the carb out, took out the jets, they were flawless, put them back in and reinstalled the carb. that showed a little life but lots of back fire with throttle. So I adjusted the idle screw and the air flow screw and it idle good but still a loud pop with throttle. I let it sit for an hour and tried again and it wouldn’t start and it started to smoke through the air box. I opened it and it actually burned the air filter. why did this happen?