I had around 150 miles on mine before I took the pump off and the hose to the head was perfect, sounds like you have some mini muffler action going on to me. Maybe they hooked it up backwards and it's sucking out exaust and blowing it into your carb.

I did the head light fix today. Mine being a 2012 and with different controls than the 2010 I hoped that they had resolved the issue, but no. Mine was bright in idle but as soon as you get the revs up it'd dim. Took the tank off and found the blue and white stripe hooked to the dark green. There was no nub of the other end of the blue and white to be found so I folded the green wire under and hooked up the blue and white to the black (Ground) coming off the ignition switch. Comes on when I turn the key and stays bright under load. Yeah