Blaster jetting question

hey guy i have a quick question i have a 02 blaster that has an fmf full system boysen stage 2 reed pedals reed spacer k&n air filter cfm air-box with he stock carb and a performance spark plug what jetting sizes should i use i am near Newark in northern jersey its almost an a half hour away from newark thanks muchh :D :-/ :-/ :-/ :-/ I:I :-[ :o X( :)
 
#270 - #290 main but plug chop to confirm. Start with the biggest jet!

What is a performance spark plug, one you put in to add power. Take it out and throw it as far as you can and fit a b8es.

If you premix bump the main up 1 more.