So I put in some new plugs, and took out the old ones that were in the car since I bought it. The plugs are OEM NGK platinums, and appear to be pretty damn old. For all I know they could be original. Anyways, here's a rundown of how they are looking.
Front left- A little residue on one half of the little 'nipple' part of it, but not the other half.
F Center- A tad of light brown crust on nipple.
F right- More light brown residue on one half of nipple.
Rear left- Lots of white/light brown residue on nip and curved part of plug (sorry, don't know names of parts on plug)
Rear center- This plug has rust and white residue on hex part of plug- unlike any other plug- mild white residue on nip/tip
Rear right- nothing terrible

All plugs are very dirty/black at the top of plug (closest to tip). All have what appears to be rust at the top of the white part of the plug closest to the hex.
I took some pics, but they aren't the best quality, and it's hard to see what I'm talking about. I think it's time to send some oil to Blackstone....If someone wants the pics I can email them...
Which cylinder has the tendency to run the leanest? I don't know how to number the cylinders, that's why I said their location and not cylinder number.

 

http://www.eric-gorr.com/techarticles/sparkplugs.html

http://www.off-road.com/dirtbike/tech/2002sparkplug/

 

Thanks Bags, that's exactly what I needed. My plugs don't look nearly as bad as any of those in the pics. Look pretty normal. Thanks.