Sorry for the newb question but my tire valve is leaking at the tip (seems like it's not seating itself properly) at the valve core (not sure of the terminology, Shrader valve?). How can I repair this? Do I simply purchase an automotive tire vavle removal tool:
Get whatever the cheapest tool is you can find. I have some free metal ones that came with a cap on one end & the tool on the other. The stems cores are standard, just release the air, screw the old one out, screw the new one in.
You can replace or try to tighten the schrader valve. It should take a minute and I couldn't see a shop charging for it. They probably have a billion schrader valves on their tire machine. If it still leaks get a new valve stem. 90 degree ones are great.
Try just tightening the schrader valve first. If that doesn't work, then just put a new one in. They have a little o ring on them. If a new one doesn't do the trick, then you will need an entirely new valve stem which consist of dismounting the tire. While you're replacing the stem you might as well get some bolt on angled stems. Motomummy has the bridgeport angled stems for 17 shipped. It makes checking pressure on the front a whole lot easier.