sounds like a o2 sensor to me. whens the last time you had it cleaned? inside of the o2 sensor box they have some foil cover foam pads. you need to replace those. the sensor itself when you take it out make sure you dont touch it with your bare hands. the best thing to clean it with is contact cleaner and a soft cotton cloth. id start there and those lil foil pads you can just clean them also but i find it better to just replace them. they are cheap. you can go to the yamaha website and look up the parts diagram for your motor. the o2 sensor is on diagram electrical 3. i say its your o2 sensor because almost every ox66 that sputters or laggs with throttle response it is usally the o2 sensor. also there is a little tube that sticks in the o2 sensor it is part 49 on that diagram. make sure you have no trash in it. ive seen lil wasp make nest in those and the motor wont run with it close up. let me know what you find
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