I looked at my plug before rejetting my Raptor and i am unsure that it looked correct prior to rejetting for the pipe i installed. After rejetting my plug, looks like this (I am unsure of the correct name of plug body parts) so bear with me. The outer edge (where the threads start) seems to be black or carbon colored. 2) The part between the top and the start of the threads, seems to be tan. 3) The part at the very bottom (curled metal part) seems to be grey.
My Raptor rips and doesn't seem to have any dead spots through the entire bottom to top. I have a FMF power core slip on, and cut the flaps out of the snorkle.
I Apologize for my ignorance, but any help with exactly how my plug should look and any other adjustments that could help me get it perfect would be appreciated. Thanks!

 

I dont know for sure but I do believe you look at the "The part at the very bottom (curled metal part) seems to be grey" that is the part that is suposta be light brown/tan.. ?

 

Fear not about the gray color on the plug thats normal.
Your thinggie that sits between the treads...(pause)...should be a grayish~tan to brown color that means the plug is perfect, not to hot and not to cold.

2000 SCRAMBLER 400 2X4

SCRAMDADDY400

 

In order to clear up the terminology, the right angle piece on the tip of your plug is the ground electrode. The metal tip just below it is the electrode. The porcelain which extends into the body of the plug is the imsulator.
The threads on a plug will always be dark or slightly oily, having nothing to do with jetting.
I'm sending you a file photo of one of my plugs showing the coloration you need to achieve.

 

Check out NGK web page they have spark plug guide.http://www.ngksparkplugs.com/techinf...q/faqread2.asp