It should be noted to anyone out there!!!!!!!:
Do NOT ever run your motor without an air filter. Just think about it, driving down the street kicking up rocks, dirt, etc etc etc. Now, your engine is also sucking in air as hard as it can... Like a vacuum. Now, let's put 2 and 2 together. Your engine will suck this stuff in. Now, your carb will take in all of this bring it down into your engine block where you have your piston, crank, and below that, your can governor etc etc etc, causing bad damage. Engine breaking damage. Friend had a motovox gas scooter (like a goped)- "It's faster without the air filter" he said- and it is... Guess what doesn't run anymore?? Mhm...
Now, special exceptions can be made for when it's logical (like to test something), so this is a perfect time to take off the air filter, especially since duckie has it up in blocks; meaning its not kicking up dirt and rocks.
Duckie: I know you said you get confused easily... DEFINITELY listen to poboys advice. This is the perfect time to take off the air filter, because that could be your problem. WHEN your kart is fixed and you are riding it around, never run without an air filter!!