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**HELP*** Yamaha CDI Unit

Old 04-27-2009, 09:08 AM
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Default **HELP*** Yamaha CDI Unit

Need some help....

I have a 1989 Yamaha L130ETXF that has started having some issues. It starts sometimes and runs fine....and then sometimes it just wont crank. Certified mechanic has looked at it and says it is firing and then he will come back a few minutes later and it won't fire. He has traced all the wiring and says I am getting voltage into the CDI unit.....but when it is not sparking there is no voltage coming out.

Has anyone had this issue and solved it without replacing the CDI or have any advice?

Trying to find a used CDI unit and not having any luck....any advice on where to find used parts? (new part is going to cost around $500)
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Old 04-27-2009, 09:26 AM
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I have a used one off of a '91 150. I bought a spare when I had my Yamaha 150, never needed it, I tested it, works fine. Dont know if it will fit your boat or not, but let me know if your interested in it.
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Old 04-27-2009, 09:55 AM
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I don't believe the CDI has any effect on the motor from a cranking standpoint. If it won't crank then you need to check into the key switch, wiring, starter relay, starter, etc.
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Old 04-27-2009, 10:10 AM
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The engine will crank....but it won't turn over...He checked everthing from the key back to the CDI unit....everything up to the CDI unit has voltage going to it.

When the plugs are sparking the CDI unit has voltage coming out of it.......when it isn't sparking...there is no voltage coming out of the CDI unit.
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Old 04-27-2009, 10:39 AM
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Check the battery cables for corrosion. I had a 89 175 that would do the same thing. If it got enough current it would start sometimes it wouldn't. Sometimes it would start as soon as you let go of the key because the starter wasn't drawing current any more.
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Old 04-27-2009, 11:23 AM
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I don't really understand how the battery could be the issue if it is getting power and trying to crank but just won't turn over....but I appreciate the response and will give it a check
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Old 04-27-2009, 11:32 AM
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unplug 10 pin main and run, see if issue still happens.
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Old 04-27-2009, 12:07 PM
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I think what you are saying is to unplug the wiring harness and crank?....we did this and thought the wiring harness was the issue b/c it started to work....but then it stopped firing again so we ruled that out
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Old 04-27-2009, 12:17 PM
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The engine will crank....but it won't turn over...

the engine will start, then shutdown?
you unplugged main harnesss and ran motor and it still shutdown?
please be a lil more clear as to try to help diagnose...

when you unplug 10 pin, you isolate motor from keyswitch, harness, killswitch,neutral stop.....
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Old 04-27-2009, 12:29 PM
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The motor will not start......the flywheel will turn and everything when I turn the key but it will not start. According to the mechanic it is not starting b/c it is not sparking.....but it will spark and start randomly.

The mechanic felt that the issue may be in the wiring harness so he disconnected and cranked it with another harness or some kind of starting device that he had....he thought this was the issue b/c it cranked up right after that.....but he left it on for a couple of days to see if it would continue to work properly and the same issues came back.
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Old 04-28-2009, 06:43 AM
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So, it's not getting spark but it is cranking over. Did you check the battery cables yet? That is what mine was doing. Drove me crazy until I found corrosion in the cables.
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Old 04-28-2009, 11:09 AM
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I spoke with the mechanic...he said he has looked over the cables and didn't see an issue. He said that some of the newer yammies need a constant voltage supply to run while mine actually could run without a battery after it was running.

He is positive that it is the CDI unit.....and luckily I finally found a used unit for $100 yesterday after calling 1000 places. Picking it up tonight....hopefully this will fix it!

thanks guys
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Old 04-28-2009, 12:06 PM
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You are very welcome.
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