Disclaimer: the last time I owned a dirt bike, drum brakes were the norm. Since I don't want to do the Hot Tub Time Machine thing and go back to the 70's, I must live in the present. I like disc brakes, but I'm stumped on what I need to do. I watched the RMATVMC video on them, and I get the idea. I'm replacing worn out pads with new, thick ones. But, the part about "spreading the pads so the rotor will fit back in" - mine won't budge. I presume this is because the pressure on the calipers is why. So I "think" I've got to bleed the pressure to do this. Is this right? I can't seem to find the answer. Oh, and many kudos to those of you who address these things. Who knew Pine Sol was the way to clean a carb? Happy to report that, plus a new pilot jet, solved my "won't run without the choke on" problem on my 450.