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Glen Motbey

1989 Yamaha Pro-4 Pro Hauler No Spark

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Hi Guys,

I pick up an old 89 Yamaha Pro Hualer and its got no spark. Theres no power coming out of the CDI unit to the coil. Does anyone know how to or if you can check the cdi unit? Does anyone know where I could get a replacement one? Thanks Ben

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You can't really test a CDI, they are a bit elusive.  You have to troubleshoot everything else that has to do with spark and if it all tests good, then the CDI would be the last option.  You might also try the "baking" technique for the CDI.  Sometimes you can bake them for a few minutes at very low temp and drive off moisture enough to get it to work again.  @Frank Angerano is a better resource on baking CDI's.

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unfortunately you cant test a cdi. @MarkinAR is correct about that. However cdi inits get moisture inside and they will not work.  Especially if its an atv thats been sitting outside for a long time.  
You can take the cdi and bake it in the oven at 200 deg for 10 min.  Oven reaching temp first then put the cdi in  no more then 10 min.  Take it out and let it cool. Give it a shot, if it works you know its a moisture issue.   

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