well i know that this has been covered previously on here but i never heard anything about if you had to drill out the brass plug to get to the pilot screw or can you just leave it be>? well i have the 03 sp 600... mabey you can just replace the jet needle and needle jet and main jet and slide spring and be fine...what do you guys think?

 

That's what the update changes are, those last 4 items you stated. See my post "Had the cold start update done to my 600, muuuch better!". You'll see for yourself.