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I have the same exact fourwheeler, same exact carb. Same exact problem, fourwheeler has a certain spot I can hit the throttle to, it bogs down and dies. If I try to stop and let it idle, it dies. Do I need to change the jet thing, or mess with that air screw ?

Have a look at that rubber boot from the carb to the cylinder real silly design I cut the weird flange part off mine and ran a new piece of hose from a radiator between it

Hay I'm back with good news! I got the same quad and carb and issue. Your running Lean or rich on the video. So that little screw on the bottom of you carb ya turn that all the way in! No not the idle screw it's the flat head brass screw air to fuel mix screw. Then back it out 3 turns start there! Engine needs to be warmed up! If you still get throttle lag backfire turn half turn out each time until problem stops, ounce stopped get on your quad do a load test in third gear if it's lagging power or bogs out keep turning the Air to fuel ratio screw out 1/2 turn out until you get full power under wide open throttle in third gear. Then fine tune your carborator. If engine gets to running hot go 1/4th turn out until engine maintains heat level then go a hair bit rich to protect the engine of heat expansion damage. Your welcome 😁 Ps. As your Tuning your fuel mixture yes you'll half to adjust your idle screw accordingly to correct RPM range. Wish I was there to help you tune the carborator and teach you the trick on how to do it correctly would save you Alot of frustration that I went threw.

I got the same Amazon carb and it does not run with the air box cover on, starves for air. Remove cover runs great. I bet you it’s that oversized main jet dumping fuel into the bowl