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12-13-2009, 12:09 PM | #1 |
Not Yet Wild
Join Date: Sep 2008
Location: Melbourne, FL
Posts: 32
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CDI Help!
I'm trying to troubleshoot my G1 which died yesterday. It has no spark at the plug when I turn it over. There is no voltage in the orange wire which is going into the ignition coil, so I don't think the coil is the problem. This orange wire comes from the CDI unit, which I'm not sure what that is. I'm assuming it regulates the spark and I know it is expensive (over $300). So how can I verify that the CDI unit is working? There is voltage coming out of the magneto's brown wire, which goes into the CDI unit.
Thanks ahead, Tom |
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12-13-2009, 01:48 PM | #2 | |
Sometime's............
Join Date: Oct 2007
Location: Tacoma Washington
Posts: 11,874
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Re: CDI Help!
Quote:
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12-13-2009, 02:10 PM | #3 |
Gone Wild
Join Date: Jun 2009
Location: Heluvabump,VT
Posts: 623
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Re: CDI Help!
I wouldn't rush into replacing the CDI unit just yet. That would be last on my list of possibilities. Most likely you have a loose/corroded connection or chafed wire. Look close at the four connectors coming out of the engine. Check your harness where it comes around the battery and exhaust. Look in the stickies section above for a wiring diagram if you don't already have one. Do you have an ohmmeter to check for continuity and resistance?
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12-13-2009, 02:22 PM | #4 | |
Sometime's............
Join Date: Oct 2007
Location: Tacoma Washington
Posts: 11,874
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Re: CDI Help!
Quote:
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12-13-2009, 02:35 PM | #5 |
Gone Wild
Join Date: Jun 2009
Location: Heluvabump,VT
Posts: 623
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Re: CDI Help!
I'm not trying to start a battle here, just trying to help the OP. Since there is no way to test a CDI control unit short of replacing it with a known good unit,it is prudent to check everything else thoroughly. If he is satisfied with his diagnosis, then your suggestion to post a "want to buy" is very good advice.
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12-13-2009, 07:30 PM | #6 |
Not Yet Wild
Join Date: Sep 2008
Location: Melbourne, FL
Posts: 32
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Re: CDI Help!
Thanks for the reply guys. I'll check the wires again as I really don't want to replace the CDI, and I don't have access to another one for testing purposes. I have a wiring diagram.
To bad CDIs are difficult to test. I would like to verify the magneto is working as this seems to feed the CDI. Does anyone know how to test the magneto? |
12-13-2009, 08:29 PM | #7 |
Gone Wild
Join Date: Nov 2009
Posts: 250
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Re: CDI Help!
I just had the same problem....no spark and nothing coming out of the coil!!!
It ended up being the group of wires that run along the battery box....seem to have shorted against the frame. Moved them and fired right up. Hope that helps!!! Stephen |
12-13-2009, 09:13 PM | #8 |
Gone Wild
Join Date: Jun 2009
Location: Heluvabump,VT
Posts: 623
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Re: CDI Help!
Pulser coil resistance 14 ohms (white/red wire to white/green wire)
Charge coil resistance 370 ohms (brown wire to black wire) Test these wires on the engine side where they come out of the engine. The black wire is a ground and should have continuity to ground. On the harness side,the other 3 should not have continuity to ground (shorted wire as skarp found) but should have continuity to the CDI control unit connector. Open circuit= broken wire in harness. Unplug the control unit during testing to prevent letting the Magic Smoke out of the box! |
12-26-2009, 10:05 AM | #9 |
Gone Wild
Join Date: Apr 2009
Location: Vegas NV
Posts: 262
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Re: CDI Help!
Just check your ground.
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12-27-2009, 11:28 AM | #10 |
Not Yet Wild
Join Date: Sep 2008
Location: Melbourne, FL
Posts: 32
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Re: CDI Help!
UPDATE:
I missed testing the ohms between the spark plug lead and the ignition black wire (ground). There is zero continuity there, and it should be 5900 ohms, right? Anyway, since my spark plug lead has cracks in it and the boot is torn up, I ordered a new ignition coil. I'll update what happens when that arrives. I think I'll also order the service manual which hopefully has all the ohm specs for testing. Thanks for the help! Tom |