Just bought brand new pocket mod scooters and the rear tire of wine won't take air it leaks back out.

cant figure out how to open storage compartment on kiki

Maybe it has a hole in it

check it with a multimeter and make sure that its putting out the correct amount of volts, it should be at least 24 volts

If it started yesterday you might have fouled the spark plug or check crank case, air intake system, and exaust pipe for dirt dobber nests if both have sat up for some time I had this problem when I bought one of the same 4wheelers what happens is the crank case builds pressure also the exaust builds pressure and will not let the motor run check for ignition spark parts are vary cheap for the pocket minies check ebay i got a exaust pipe for 13 dollers 49cc also check motosports max.com or type Kazuma.com in your search bar

Use a wedge. Place the thin end between the tire and rim. Then push the tire off using the wedge and your other hand, work your way around the circumference of the tire until it is off. Use the same process to put the new tire on. But this time you will push the tire on the rim.
This is a pic of the ideal tool you should use:

mcdevito75 here, Generally the tire wold have to come off the axle, this requires tools, then the inner tube would need to be tested for leaks in a tub of water. BEST BET, let a tire repair shop in your area do the job.

Hi
Deflate the tire and then you can gently move the valve to a straight up position. Now refill the tube.

For every foot of space between sprockets, there should be slack equal to 1/2 the height if a chain link.
If the chain link is 1/2" high and the sprockets are 2 feet apart, there should be 1/2" of total slack. Measuring BOTH upward and downward into the whole number.