hey guys, i just got an 06 rmz 450, and i noticed that the rear wheel doesnt spin nearly as freely as my old kx 250, the owners manual says to clean the chain with only kerosene, which I plan to do, and to lubricate with a heavy motor oil. I have been using Maxima Crystal Clear chain lube on it, but the chain still seems kinda tight, not tension tight because it has at least over 1 1/2" of slack, and the bike has at least over 1 hour on it. i was thinking of spraying some WD40 on it to see if it free's it up, but i dont want to damage the orings. Is this normal? I have never had an oring chain before, so i dont know if it just takes a while to loosen up and break in. Any suggestions?