I have a 2006 WR250F and I am wanting quicker acceleration. Right now it is 13/52 (stock). I am trying to decide if I want to go 12/52, 12/53, 12/54, or keep the 13 in front and just change the rear (to 53 or 54). A deciding factor is if dropping a tooth in front will cause wear problems...? Also, I have read somewhere that you want an even and odd number of teeth, rather than both even or both odd. Is this true?