New to the gasgas world

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I have just pick up a 2010 ec250 which I am really looking forward to riding this year. I have read through the threads looking for tips and up grades. I would like to do the head and carb mods but I live in canada. Can somebody help a new gasgas rider out? New to gasgas but not riding I grew up racing moto and endro, most of the people I ride with still race, but I no longer have the time with a young family. I still like to ride hard and would really appreciate any tuning tips. Thanks