I know what a spark plug is supposed to look like in my raptor, but is a 2-stroke the same...90cc predator, slightly brownish??

 

Slightly brownish sounds right. You want to be aware of excess oil on the plug, this may cause fouling and may indicate too much of an oil mixture. There are many web sites out there with pictures of different spark plug problems. If you googled this topic you could find a lot of info.

 

Look for "paper bag" brown........and depending on how you ran it before(if that is your test......)......then it may take a while to color the plug......so look down in, at the electrode

 

as long as it doesnt get any where near white your fine. coal black is way too rich