best motor for hills

[Z00mz00m]

ok i live in west va and i have many hills around here....i dont know what engine to buy....i want to be able to ride down the road to my grandfathers...and that way has many hills....
i know a 4-stroke might be best..but i dont want a motor mounted over the rear tire..
is there any particular kind of engine cheaply modable..??
because i still want to ride it in town..but want to have maximum power for the hills if i do have to ride to my grandfaters.. i dont know much about these small bike....
because i am allways working on a big block ford..
so any motor and mod parts for that motor u can think of..///please tell

[Venice Motor Bikes]

I like the 80cc 2-strokes... They're inexpensive, easy to mod, & easy to fix.

[TheBeak]

I live in coastal maine
with a ton of huge hills on the way to work, one is just a beast
i ride my bike evrywhere
its my only mode of transportation, and its 15 miles into town, so lots of riding and lots of hills

i have an 67cc 2-stroke (80cc) from zoombicycles and it makes it up all, no pedaling required
these girls have serious power
of course then there is the fact that i only way 140lbs, but y friend is 180 and he has no problems with them either

[azbill]

I have used a 66cc with a 50 tooth rear sprocket and climbed 24 miles up Mt Lemon in tucson without pedalling
I wasn't the fastest, but I did the least work and had the biggest smile !!!