I had this same issue with the Razor E100. I couldn't even remove the plastic cap it was so recessed. Here's what worked. The value comes from the factory very recessed in. It's so far in it's hard to remove the cap with your fingers. You'll need to get the value loosened up and pushed out a bit. You will do this from the other side of front wheel using the hole. The value can be manipulated slowly to stick out about an inch from the plastic wheel. It takes some time and patience. First, you’ll need to turn the scooter over and rest it on the handle bars and back of the deck. Put a towel or flatten box under it if working on a rough surface to protect the scooter. Then used the supplied Allen wrench or similar object by putting the long end of the wrench into thru the opening hole on the other side of the wheel. Wedge the edge/end of the wrench against the value from the other side of the wheel and push hard to loosen up the value. This takes some time. Do this on both sides of the value and also against the center of the value. It took me about 5 mins of careful pushing. Eventually you will be about the get the value to almost a right angle from the wheel and sticking out about and inch. Then remove the plastic cap. This will give you room to attach a bike pump. I actually had to push the value back in a bit once finished so the wheel could turn freely. It will work, just be patient and forceful. Take your time.
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I had this same issue with the Razor E100. I couldn't even remove the plastic cap it was so recessed. Here's what worked. The value comes from the factory very recessed in. It's so far in it's hard to remove the cap with your fingers. You'll need to get the value loosened up and pushed out a bit. You will do this from the other side of front wheel using the hole. The value can be manipulated slowly to stick out about an inch from the plastic wheel. It takes some time and patience. First, you’ll need to turn the scooter over and rest it on the handle bars and back of the deck. Put a towel or flatten box under it if working on a rough surface to protect the scooter. Then used the supplied Allen wrench or similar object by putting the long end of the wrench into thru the opening hole on the other side of the wheel. Wedge the edge/end of the wrench against the value from the other side of the wheel and push hard to loosen up the value. This takes some time. Do this on both sides of the value and also against the center of the value. It took me about 5 mins of careful pushing. Eventually you will be about the get the value to almost a right angle from the wheel and sticking out about and inch. Then remove the plastic cap. This will give you room to attach a bike pump. I actually had to push the value back in a bit once finished so the wheel could turn freely. It will work, just be patient and forceful. Take your time.