I just finished Daves Mods to my "01" 650L. It made quite an improvement. I went with the 55 pilot and 158 maint jets. Actually, I ordered the hex main jet so as a result of not wanting to wait on another round main jet, I drilled the the stock main to the same bore as the as the hex main I ignorantly ordered. Every thing seems fine except for this hesitation or bog it seems to have when I crack the throttle off idle. It doesn't last long, but enought to know it's there. Do you think I might need a larger main jet? I de-smoged and de-snorkeled it, installed a K&N filter and the jets. Set the fuel mixture screw between 2 1/4 and 2 1/2 turns out. Shimmed the needle @.024. Stock exhaust. Any suggestions... or is it just the nature of the beast?