Hi All, New guy here, I'm awaiting my 02 WR426.I've really enjoy all the info and fun shared here. I'm riding again after a 5yr. dry spell.(neck surgery!) I have a zillion questions, like what the heck is a BK? (Pardon my stupidness,I've been out of the dirt bike loop awhile.) Best aftermarket exhaust or YZ exhaust? how do I time to YZ specs? ect.ect... Anybody in the Ventura county CA.area looking for a riding buddy, specially during weekdays?