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Originally Posted by Letum
Might be worth checking your needles whilst you have them handy. I have traced
more than one problem engine down to worn needles. The wear can be hard to
spot too.
*edit* If you are really, really lucky a local mechanic might have a jet-testing box.
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balanced airflow into the carbs can have a big effect of carb sync as well so make sure both filters are clean and in good condition (im sure you did but i say it anyway just in case it was overlooked)
i was told by a very good bike machanic that i trust, that needles wear down very easy and before its enough to be easy to see, it will have already been effecting how the bike has been running for a long time.
his advice to me was for the price it costs it makes sense to replace the needles and jets whenever you are having carb issues you cant seem to resolve. he said bad fuel air mixtures are more damaging to a bike engine than dogging it.