Loose nut on steering head
So I went riding today and put about 150+ miles on the KLR, and did my first off-road riding with it. From time to time when I would hit a bump I'd feel a sharp feedback through the bars, and when we finished the ride I found the nut on the very top of the steering head was so loose I could spin it with my fingers. I guess the dealer's 'thorough inspection' for traded in bikes leaves a lot to be desired.
Anyway, what is the best way to access the nut? Taking the bars off would be a sure bet, but has anyone used an open end angled wrench or a crowfoot to access and tighten this nut? Anyone happen to know what size the nut is? My KLR is an 06.