pop a wheelie

i just wanna know how people pull wheelie....i mean does your bike have to be full tuned to pop a wheelie on full throttle...my mate give his bike full throttle and it pops a wheelie...its amazing... he just goes from no throttle to full throttle and it pull the front wheel up nice and smooth...how do i do that?


also...my spark plug is always black...but dry...never wet...it runs fine though..is that normal?