guide to correctly assemble a Walmart bike I bought a genesis max air from Walmart last fall used it a few times before the winter and two weeks ago brought it back out.  For the last two weeks me and the wife have been riding about 8 miles everyday and went and rode some trails last Sunday.  So far the bike has been alright but I think I would feel better if I reassembled it.  So I was seeing if someone knew of a guide or video on how to tear it down and put it back together or really any suggestions on it.

Problems I've already noticed is the front derailer won't shift into third it's like the cable is all the way tight in second and the disc on the front wheel is sitting way too tight in the brake.  I don't have any experience working on bikes but I own a construction Company and am a trained mechanic (I service all of my equipment) so I think I could figure it out with some help.
If you are mechanically inclined most of the adjustments are straight forward. There are many on line tutorials, Park Tools website and the often mentioned Sheldon Brown are my personal favorites. As @ Batman has stated BSO (bicycle shaped object) can be frustrating to maintain. I have serviced them and the bearings don't get any smoother when I assemble it than it did from the factory. The primary concern from the design is will it function (not is it smooth ,is it light ,is it durable)  with parts from a certain pricepoint To use a comparison you may relate to. If I buy a tablesaw for $125 it may last me 20 years of occasional homeowner use, if you used it commercially it will fail much sooner. A Walmart grade bicycle will function fine for an occasional ride before it needs maintenance. A higher quality bike (not just when new but after years of use) will be easier to tune and stay in tune longer. It will be repairable and upgradable.