maybe too much oil is the reason for your problem.
change oil. clean carburettor.
buy yourself a repair manual.
i can recommend the clymer manual (Clymer Pubns; ISBN: 0892875461). of course it's for xt600-models up to 1989, but engine and general work-procedures are almost the same.
regarding carburettor-cleaning, you may refer also here: http://www.xt600.de/xt_technisches/%...r/vergaser.htm
of course its in german language but at least the pictures might be helpful.
second carburettor works only in higher revs.
the secondary throttle starts to open when primary carb opening is 7 mm.
good luck!
klaus
mailto:klaus@xt600.de
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