My best guess is that you have an intake air leak. You are sucking extra air in somewhere, easiest way to track down an air leak is to spray carb cleaner all around the carb and motor, while listening for changes in the engine speed. When you hear the motor react, you have found a leak. I will be moving this thread to the Suzuki forum and changing the title, please post the year of your machine so I can add that to the title as well.
Yours truly, sincerelly, love always, Josh aka The DirtDemon.