what should i do to my stock 93 blaster???

i wouldnt bore it out til it needs it when it blows up just bore to the next size and u should be able to beat a 250ex when mine was completly stock i would eat 250exs
 
should be able to beat it stock! get a toomey pipe 30mm carb uni filter and rejet, dont bore unless you need it! do a compression test first and the shop will tell you how much to bore it, bigger isnt better unless its a big bore kit!