Hey all, sorry to post such a negative comment as i'm a newbie, but my TZR is really grinding my gears. recently bought this  bike and was over the moon, soon as i started hit that power band i've had a huge grin on my face. problem is every day i'm changing the plug!! it always comes  out with a thick black residue on?!?  I've been advised it is getting to much oil? how do i restrict the flow?  even consider taken pump off and premixing?? appreciate all advise.