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If he packs and takes care of your motor as well as his toes you are good as gold on it...
IMO u are going to want a larger/aftermarket tb to keep up with the needed air flow,,,, unless u trail ride only and dont need the upper rpm powerthe +3 has proved to be to small for a well built 686 cc on a +1 head for those looking to race.
ASL?it works at 4k ft.JMO