I have a 2007 kx 250 two stroke.The stock spark plug is an BR8ECMVX.I fouled it today and the only other one i have is an BR8EIX.Visually the only difference is the length of the white ceramic neck.The bottom is a little different too.It runs with it in,i guess what i am asking if anyone knows the difference and if my bike will get wrecked if i use it.I cannot get the proper one till tuesday as we have our labour day holiday up here in canada.