that plug wont tell you too much {in terms of specific jetting range}
http://www.yellowdogracing.com/techstuff.htm
carb tuning
http://www.blasterforum.com/threads/how-to-plug-chop.53237/
how to plug chop
http://www.blasterforum.com/threads/plug-chop-how-to-vid.48226/
how to plug chop {with video}