07 yfz 450
#11
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I've got an 06 and I am the only one that I know of that does not have the bogging problem. If you are at a high elevation you may actually be rich from the factory. I am at sea level so I was lean. I went to a 168 MJ and I vary between 45 and 48 PJ. I also bought the zip TY adjustable fuel screw.