set up with the right parts is big bore werth it ?

a HUGE difference if you spend the money.

get a 240 kit, get it ported, with a +3 stroker (ported for the stroker as well), big bore pipe(dyno port/vitos are both good 240 pipes) 35mm carb, 14/38 gearing, better intake ie k&n or a aluminum airbox with a good foam filter. the stock airbox is restrictive.
 
haha i want to see this "difference" because my blaster is pretty pimped out now and i have plenty of money in it and no more to spend so i want money to try all this sh*t!