agreed, sounds like the plastic pilot jet is playing up......what I also find is the O-ring on the plastic pilot jet can perish and cause the same problem, I now carry plenty of these pilot jets spare (peanuts on ebay) as its a PITA when it does go wrong and ruins your day if you haven't got a spare, and the failed item cant be fixed.......check this link which is really useful, print it off and chuck it in your karting bag of toot.
http://www.outdoorking.com/forum/uploads/usergals/2012/07/full-2772-7121-honda_carburetor_check_sheet.png
As you can see its No2 on the list of 12 reccomended Honda checks, get a 0.3mm pin and shove it through the end, when I have done this its always been blocked with crud!
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