Are your tire valve stems cracked on your Chinese scoot? I thought so. I think they all are. It is a matter of time before they leak, if they havent already. This is a simple solution to the problem. You will get a set of tire valve stems and the tool to do the job. This tool is great because you dont need a heavy duty air compressor to air the tire back up, nor do you need to remove the wheel. Thats the trick! Replace the tire valve seals in your driveway! check out the video! This will save you time and money. Be sure to take a look at our chinese scooter upgrade kit as well. The worst part of a chinese scooter is the rubber (the tires are not bad). Fix these and they can be great scooters....... But let start with this dang valve stems!