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Yamaha was supposed to replace the ECUs on the 07 that had the throttle lag issue, or at least fix the issue can't remember is the ECUs were physically replaced. There was either a TSB or a Recall I can't remember. But search throttle lag for 07s and I'm sure you'll find it.

I don't know if Yamaha will still fix the issue this late though, that far out of warrenty, but you should check with your dealer. You may be stuck either buying a used 07 ECU that doesn't have the throttle lag or a used 08 ECU may work. A power commander will not fix the issue it only does in line adjustments, however a reflash from one of the race suppliers such a SBU/FT may fix it.
 
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