i have a 2008 650l did daves mods 5 years ago. ran perfect till 2 days ago. my son has matching bike. i took carb off cleaned. checked gas cock etc..at higher rpm it bogs bad even after cleaning. i took my kids carb out of his bike and put it in mine then it runs perfect. what is up im confussed. it is definatly in my carb some where? i took it apart and cheched i thought everything thanks