Hello, I need some help. I have a scrambler 400 and am confused by all the talk of rich/lean, jet size, clips on needles ect. Can anyone out there help me out?
My plug is black, is this a jetting - air screw thing or the oil injector? Is lean to little fuel? Rich to much fuel? AHHHHHHH!!!!

 

Here's some links that may help:

http://www.motocross.com/motoprof/mo...lug2/plug2.htm

http://www.gnttype.org/techarea/engine/plugs.html

http://www.strappe.com/plugs.html

http://www.nightrider.com/biketech/spkplghnbook.htm

http://www.hioutput.com/tech/plug.html

http://www.victorylibrary.com/mopar/plug-read.htm

http://www.cyclewerksracing.com/reading_spark_plugs.htm

http://www.splitfire.com/plugtips.htm

http://www.ngksparkplugs.com/techinf...31000&country=

http://performanceunlimited.com/illu...parkplugs.html

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JETTING

http://www.speedandsport.com/jet.html

http://www.dynojet.com/motorjet.shtml

 

Thanks, the jetting sites help.