Alright, so, I'm new to this whole scene, as well as the forums, and I'm really wanting to build a motorized bicycle. I've done some research into several aspects, and I now want to directly ask some experienced users.
Problems: Don't have a bike right now, and I don't know what engine kit to get. Now, here is a warning, I'm looking at walmart bikes, so before you start bashing walmart or anything of the sort, keep in mind that not only am I working with a budget, but I'm going for my first
ever motorized bicycle and not wanting to drop a lot of money into something that I may not stick with for long (or if I FUBAR a bike, have it be no big loss). That being said, here are the 3 bikes that I have an eye on at present, in no specific order:
A Walmart.com: NEXT Amplifier 26" Men's Bike: Bikes & Riding Toys
B Roadmaster 26" Men's Mountain Bike - Walmart.com
C Huffy Men's Road Bike, Savannah - Walmart.com
The two main engine kits I've been looking at are:
A Jet 80cc 2 Stroke Bicycle Motor
B Silver Slant 80cc 2 Stroke Bicycle Motor
Now, in regard to the engines, I'm a North Carolina resident, so I'm not legally allowed to be riding anything greater than 50cc, and the two kits I listed go back and forth between 66/80cc and 48cc in the description, but have 48cc in the title, and in the specs listing, so that's good enough for me.
Primary orders of business: Is that a decent distributor for engine kits (where should I go if it is not), are those kits I selected going to be decent, and are those bikes going to be sufficient (is the engine going to mount properly, with ease, etc.)?
Bike A has an aluminum frame, and I know some people will stand opposed to that. I'm 6'3" and only about 140 pounds; I doubt it's going to be too much weight or force to crack the frame or bust spokes. Bike B has a steel frame. It is also for some reason 10 USD cheaper. Bike C is listed as having a Hybrid frame, which doesn't tell me anything.
 in proper condition or frame style. Also see 
 from what I have read so far primarily on these forums, there are no significant differences between kits other than displacement, some accessories, and warranties
 again, no bashing just because of the Walmart origin. I got a bike from a Walmart, possibly a Target, when I was 13. It still rides well and I'm 21 now. Only issues are the rust from me leaving it outside for years, a frozen rim brake (rusted, I assume), and a busted gear shift which was from me crashing the bike one time.
Thanks for your time, everyone.