Kits like cobra or sigmajet are great for tweaking, judge your present performance first and determine if you're in the ballpark; Is it responsive throughout the powerband? How's your exhaust looking? If the pipes are showing signs of getting too hot (chrome bluing, exhaust tips chalky white=too lean, tips black=rich).
On to the spark plugs. "Reading" a plug gives an excellent picture; after a somewhat aggressive run with out too much idling pull the plug and have a look at the porclean insulator just above the electrode gap. Best is a nice even cocoa brown. Black=rich, white=lean. I would suggest zeroing in thoroughly, then consider going above and beyond if you wish.
SOURCE: I have a 2003 kawasaki vulcan 800 running cobra
it is best to have the carb. jets changed for better perform. it my help the pipes from bluing also.you can go on line AT J AND P CYCLES .COM THEY MAY CAN TELL YOU WHAT SIZE JETS YOU NEED NOT SURE.
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