motorized bicycle advice

[davida]

I am a 220 pounds and I want to get a motorized bicycle kit to add to my bike.
I do sometimes ride mountains

I was looking into the following does anyone have experience on what to advise or not to advise?
http://www.ebay.com/itm/251079789271?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2648

http://www.gasbike.net/bike-motor-kit-grubee-2011-skyhawk-4-g-t-belt-v.html

http://www.bicycle-engines.com/49cc-4G-T-Belt-Drive-Complete-Gas-Powered-Engine-Kit.html

what is the difference between 2 and 4 stroke?
do they all need oil? is the gas the regular gas you can get from a gas station

what's safety on these bikes


if you have answers on any of the above please tell me

 

[JonnyR]

welcome to the forum

2 stroke is like your weed eater and 4 stroke is like your car

2stroke is gas and oil mixed 4 stroke regular gas put oil in the crank case

and safety is a DOT helmet leather or race jacket and pants are a good idea

also a headlight and tail light if you are going to ride at night

 

[davida]

thanks for your reply

how do the different kits compare?

are they difficult to install?
Will they fit any bike - I have a Schwinn select series