Retrieved my 02 RSMV from Master Mechanic (Yamaha Certified) Petr Novachek. I have known him for years and we are friends. Had the local dealer work on it and...well that didn't work. Petr found left out parts, choke cable not not connected to all carbs, and spacers on #4 carb diaphragm missing allowing unmetered air to cause backfire. I knew that I screwed up one week after bringing home a running bike, when it started the backfire. Talked with shop supervisor and he asked me what could be wrong with it after they worked on it and charged me $700. My reply was "that is why I brought it to you".
Now it is right with smooth acceleration and no backfire.
Happy boy now. :happy65: