Whenever I ride my 26"

find a good bike shop. theyll have what you need

Cable adjustment is complex. Suggest taking your bike to local bike shop for assistance

I am going to provide a link to a video that will show you how to determine the correct size of pedal for your bike. Identifiying the Proper Size Pedal for Your Bike

Yes, get a very light chain lube. Apply to the chain, pedal to ensure that chan and gears get coated evenly, and wipe off excess with a paper towel or rag.

which chain is falling off. the one from the motor? if so check to make sure the sproket (ps i cant spell) and gear fom motor is lined up. on mine i remember having to flip the rear sproket. are you using the chain tenchiner pulley? i think the one that comes with the kit dosnt have a deep enough gruve. i got rid of it all together, and just made the chain fit with like 1.5 to 3 inches of play. ive seen people use the tenchiner from the rear shifting gear on a mountain bike. thats what i suggest. if its the chain from your pedals thats falling of the the guys from the bike shop are messing with you or the alined the wrong chain. or maybe you need to resize the chian they just got the wheel straight.

Loosen the axle nuts on both sides. Slide the wheel forward to disengage the chain from the gear. Now pull the wheel up and out the back, sliding the chain over the axle as you bring it out. Hope this Helps FixYa up.

You, uh, tighten it.

http://www.huffy.com/Support/OwnersManuals.aspx

http://www.huffy.com/ExternalLink.aspx?url=/pdf/ownersmanuals/e0664c94-726b-49d6-8322-5e053dca5b0a.pdf

Page 22.

Web search "chain slipping off" for some ideas to better define and visually analyze what is really happening and maybe find the solution yourself.

You need to evaluate wuith your eyes and ears what moving parts are contacting other parts of the bike in an undesireable way. So, what moves when you pedal it? The crank and chain.

Take it to a Local Bike Shop and have them evaluate what's compatible with it.