Suzuki RM125 2007 Front wheel HELP!!

My son has a Suzuki rm125, and from what I can tell by the number on the frame it is a 2007. WHen I was riding it the other day I noticed the front wheel had a click and it was wobbly, took the wheel off and sure enough there is a chewed up bearing. I have a couple questions: Only one spoke is just a hair loose, can spoke tightening straighten up the wheel? This bike has a front drum brake, but every wheel I can find on the internet is setup with a rotor for disc brakes. Can I find another setup for drum or do I have to convert it to disc and if so can I use the same wheel? I know the bearings are cheap, and I intend on doing it myself, but how uch would total wheel replacement cost? Tire is fine...
 
What is the difference? I was told me when I bought it. All of the same issues still apply though, are front drum brakes common to that model?
Yes, you can tighten the spokes..The DRZs have drum brakes up front...Make sure you get bearings for the DRZ ...The RM is totally different bike.
 
I just looked up some and I see a few with drum brakes in the front, that makes me feel a little better. I'm still not sold on being able to straighten the rim by tightening the spokes, there is only one that is slightly loose, but thanks for telling me what it is, wrong parts always suck!
 
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