First up, does it happen when you chop the throttle?
Second, have you changed your clutch lever (I'm serious about this)?

And also try this...because I think some dirt/dust/crud has got in your tank during assembly and may have fouled your injector.

Pop you air box. Unscrew you fuel injector screw (use the supplied screwdriver for this), unplug harness and pull out you injector. Watch out for the o ring...don't loose it. Activate your injector with a 9 volt battery and a couple of wire/clips and and spray contact cleaner thru it. Then spray compressed air thru it.
Or drop down to the nice man at the local garage and ask them to clean it. It should cost you squat.
Reassemble. Make sure you seat the o ring properly or it will leak.
Enjoy as you marvel at the benefits of having removed the crud from your injector.

Remember to do this every time you service, clean or otherwise tinker with you orange beasty.