I honestly didn't even see your post in this thread. I mistakenly responded to the OP without seeing the date on it because I never read this thread when it was new, and the first few posts were the first ones that showed up when I clicked on the arrow that takes you to unread posts in a thread. If you think I'm so useless, try using the search function for "clogged jets" and you'll be directed to this
thread most of the way down the page of search results. That would be more useful than threadjacking old threads with a semi-related topic and bringing them back to life.
If you're getting a larger pilot jet to compensate for dirty carbs, that's not going to make any difference. You won't need larger pilot jet unless you ditch the airbox, which I don't see that you've done based on your other posts. What you need is to clean your carbs (linked in previous paragraph)
more info on carb cleaning (with lots of pictures):
http://faq.ninja250.org/wiki/How_do_...n_the_carbs%3F