the 2-stroke kits with everything youll need can be found from $99-$200
they come with engine,carb,muffler,gastank+line,sprockets,throttle,clutch handle,cdi,bolts,mounting brackets,plus more all in a box.
all you do is add a bike.
its better to use a full size 26" bike and make sure you have plenty of room in the v-frame.
and regular size frame poles are easier to install instead of oversize frames.
disc brakes are a plus but regular ones work ok too.
its also good to have a bunch of tools and spare parts like nuts and bolts and stuff like gasket maker and gas rated teflon tape around the house.
websites: dont forget to add shipping price and its diffrent for each one
thatsdax $ 98
gasbike $119
kingsmotorbikes $119
bicycle-engines $199
zone8cycling $149
bikeberry $119
sickbikeparts (parts only)
bikeengines (goldeneagle)($559 and up,but these are rackmount 4-strokes)
e-bay $???
take a look at each site,theres more than i listed,but i wont tell you which one to pick from.