Proper jetting is the fisrt stop.
If you are going to mess around with gaskets, just get the bloody head done, it's cheap, any body with a lathe can do it, just make sure you adjust the compression ratio too. There are numerous posts telling you how to do this, or if you really need, ask me and I'll make a guide.
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2006 EC300 Enduro - Ignitech CDI - 38/NECW#2/165 FMF gnarly, FMF shorty, .50 front 5.7 rear
2016 RM-Z450
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