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I have a Yamaha EX570, I started it to show a friend then i pushed the stop button to shut it down. I went to go start it another time but now there is no spark. Why and what would have caused this? It was working fine. All of a sudden there was no spark for either plug, i even changed the plugs and still nothing. [?][?]
 

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Did you pull the button back out? It is most likely a problem with the kill switch. May want replace the kill switch.
 

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Yep^^^
 

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Same thing happened to me. We discovered that it was the CDI box. You may want to check that if the suggestions above do not work[:D]

CDI charges up a large capacitor to several hundred volts, and dumps the charge into the coil at firing time. It gives it a hotter spark. No spark = CDI OR COIL[;)] Most of the time
 

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To find out more on this check out this old post. It may help, it is electrical related.[:)] TriumphoverU explains this very good as always.[:D]


http://www.snowmobilefanatics.com/snofan/topic.asp?TOPIC_ID=2898
 

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On some older Yamahas there is also a cutoff switch in the carb that can cause the same thing. My brotherinlaw did the same thing - started it shut it off, tried to restart - no spark, after ripping half his sled apart he finally took it to the dealer, it was athe cutoff in the carb(fixed in 1 hour - or at least that's what they charged)
 
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