Hi
I had my TTR 600 dynoed last week after it was running badley kept cutting out at low revs and also missfiring.
I got it to run better for a while by turning piolt air screw inn makes it leaner,but then the problem returned.
After being on the dyno the mechanic said it was very lean but could not get it to run any better by adjusting piolt screw so stripped and cleaned carbs.The bike is running better now. It was making 36 BHP which I thought was not very much but the shop also have an XT 600E which makes 33BHP on the same dyno.I have a CRD pipe and different cam so expected a bit more then 36 BHP.
As for your bike check that the engine breather which plugs into airbox is ok as if this comes off or splits you will be drawing more air through carbs making it run lean.
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