I just purchased a 600 f4 and love it. The only thing I noticed is it has a slight sputter but I´ve only noticed it in when first taking off after that all is great. The bike has a aftermarket exhaust (two brothers) but I don´t think the carbs were jetted. So I guess my question is will that fix it and is it something that can be done by me or should I take it to a shop? And I wonder how much of a difference will jetting the carbs make?