05 zuki400 w/yoshi exhaust..bogging down in higher gears no power at all can't even take the small hills now...could it b the jetting [img]i/expressions/face-icon-small-mad.gif[/img]

 

Yea it sounds like you need to do some rejetting, i've had the same problem

 

check your jetting> it also happened to me, my main jet fell out. it would idle fine but sucked the rest of the time
or you could be running to rich or the clip on the needle is in the wrong place. drop down 1 size on you main jet and see how it runs