If there was a richer running in setting it would of been reset at the first service...I take you didn't get the first dealer service? Yamaha use their own nasty pump and not a nice Mikuni like everyone else - there is most likely a screw to remove on the carb body where the slide runs,as you open the throttle you will see a dimple on the slide...hold it there.With your other set of hands remove the pump cover and with your other set of eyes on the spare head check out the pump - the cable fits around a drum,this should have some markings that line up with other marks on the pump body or engine case...set them there.If you are mechanicly adept and have worked on these things before,then my comments will make sense,if they don't - get a manual.
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