nobody can tell you exactly, we can suggest a range of jets, every bike, temps, elevations, ect are different.
set float height before any tuning:
http://www.blasterforum.com/threads/float-heights-and-how-to-adjust-them.50565/
for that carb on a blaster, you MUST have....
#6 slide
DGH or CEL needle. probably CEL for that 240 unless your at very high altitude.
suggested jetting:
48-52 pilots, tuned like this:
http://www.blasterforum.com/threads/adjusting-your-airscrew-pilot-jet.51060/
150-162 mains, plug chops to tune:
http://www.blasterforum.com/threads/how-to-plug-chop.53237/