Spark Plug

VespaCIAO /

I am ignorant on 2 cycle engines. I was wondering when the plug sparks, what does this cause. Once we get a spark what does that spark do? I would appreciate someone explaining the basics of how the moped motor keeps the wheel turnin.

Re: Spark Plug

The sparkplug ignites the compressed fuel/air mixture which burns and expands pushing the piston down, and the piston is attached to the crankshaft creating the revolving motion.

Re: Spark Plug

problemaddict /

Check out this site for all the info on how 2 stroke motors work:

http://www.howstuffworks.com/two-stroke2.htm

Cool animated graphics to show you whats happening.

For now, the plug does the same as in a 4 stroke motor. Fuel and air enter the pistons cylinder, the piston rises, compressing the fuel and air. Then, the spark plug fires, causing the fuel/air mix to burn. This creates ALOT of pressure which PUSHES the piston back down. Then the cycle repeats.

This is obviously the basics. Check out that link above, howstuffworks.com is a great source of information!

Mike K.

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