Gratitude is from the rest of us lurking on the sidelines gleaning a hint of your hard-earned wisdom. When I get another ride on my Tracker I may have some observations on jetting deficiency. I seem to " burbble" at part throttle 25 to 35mph. I can formulate my impressions with more saddle time.But, until I post a question, please get on with your lives.. These responses so far have me studying and thinking.