For those of you who want to learn more about 2 Stroke engines, carbs & spark plugs, surf:

Engines:
http://science.howstuffworks.com/two-stroke2.htm
* Animation and lots of other 2 stroke informative info...

Carbs:
http://www.motocross.com/motoprof/mo...1/carb101.html

Spark Plugs:
http://www.motocross.com/motoprof/mo...lug2/plug2.htm
http://www.ngk.com/sparkplug411.asp
& As seen on its left side index, this site is full of lots of details. For NGK coding details, see its "Manufacturer's Numbering System - NGK" at the bottom left of the page. Very interesting stuff...

Hope this helps someone who wanted to know more of "how does it really work?" inquires.....