I don't mean to offer such a simple suggetion, but I fought this problem on my Yamaha after a top-end rebuild. Part of the rebuild was to install a new spark pulg. For the longest time, I was getting plugs correctly gapped right out of the box. In fact, I quit checking them. And that, was the problem.
The new plug was gapped at .035 instead of.024. A little correction on the gap, and the bike was back in the game. It was that simple, and I had also been through the carb at least twice.
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Scott Rendleman
AMA D17 - Hare Scrambles
50+ class - #657
2008 KTM 200 XC-W 
1994 Yamaha WR250Z 
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