Engine Information 
    http://www.animatedengines.com/twostroke.html

Clutch System Operation  
    http://adventure.howstuffworks.com/outdoor-activities/snow-sports/snowmobile1.htm

Various Resources
    http://www.snowmobilecourse.com/blog/2011/12/snowmobiling-101-parts-and-terminology/  
    http://www.gosnowmobiling.org/beginners-snowmobiling-tips.html
   Bourgeois, John. The Sledders Bible. lulu.com, 2014, Print.

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