Pleasehelp

Any more opinions before I get her sent to the mechanic?

Awesome forum love how easy it is to embed photos and videos and how helpful the community is

Thanks I'll be getting a mechanic to clean it, do you think he'll be able to since I've ruined one of the screws? heres a video of it running okay i think it's running lean? Again sorry for lack of knowledge new to this stuff :/

Drained the old fuel and it looked yellow almost like a stream of piss, added new with an additive cleaner slight improvement but if I get it to run right it'll only idle for around 5 minutes before turning off and if the choke is on sometimes it gets way too fast. If I turn it on with the same choke and idle mixture screw settings over and over the outcomes are different every time :/ also it turns on easier better when in reserve i rid it around my frontyard in 1st and reverse i feel like it's much better then just idles terrible and sometimes pressing the throttle makes it cut out power instead of giving power.

I've slipped the bottom screw on the carb but I emptied it from the fuel tube from above, is it possible for a mechanic to open the carb still with a damaged screw I'm worried I've ruined the entire screw due to ruining the screw

Thanks a lot, any idea what could have happened in one week to cause all this though?

Thank you that was extremely help full, do you think it could be something worse than the carb? It got kinda hot but apparently a clogged carb can cause that? Also a tinking noise when it idled really fast but I got scared so left it off since

Air filter is cleaned and oiled, what's the most effective way to drain the old fuel?

went to see a raptor 350 2007, was in good condition and started and idled fine etc but it had been sitting for one year. when I went to buy it a week later (guy can't ride he's on dialysis) wouldn't idle properly and now it backfires and idles too fast and if i slow it down with the "idle screw" it slowly stalls out and the choke seems useless too if its on idles too fast if i move it a bit it turns off. My theory is when i turned it on the first time i went to check it out the dirty fuel ran through the carb etc and when i turned it on next time to bring it home it had got clogged due to me inspecting it the first time. sorry for lack of atv knowlcehe this is my first non chinese quad. i want to empty the fuel and try again with clean fuel and a fuel additive but I don't how to drain it should I buy a syphon and pump is that effective enough? Also a video at its worse is attached. Thank you Also 1/10 times it will idle okay and won't back fire when giving it throttle