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Hello,

I have a 1979 Yamaha EX440 that needs a new CDI. I tried a 1984 SRV540 CDI box that I had laying around and it doesn't seem to work right. I have spark but it doesn't start. Are the CDIs different from one another in how they signal the spark?

Thanks
 

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Welcome
Yes every year can even be different among same sled!
Did you just not have spark?
There are several kill switches that could be intermittent
 
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