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Post by edlinuser on Apr 14, 2009 18:32:56 GMT -5
I've been having some intermittent problems with hard starting and lack of power. It now refuses to start and there is no spark.. I think it is a bad CDI. Is there a way to test it using an Ohm meter?
OT: Search is limited to words of 4 or more letters. I wish I could search for CDI and CVT.
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Post by crazyivan on Apr 14, 2009 21:50:15 GMT -5
stupid question, but did you make sure the all the connections are good and rust free? also could be your startor
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Post by Skoot on Apr 14, 2009 23:52:29 GMT -5
I had a similar problem. Check the wires going to the coil. If the spade connectors are loose, chances are the CDI is fried. Check the resistance between the two coil terminals. It should be around 3 ohms. Now check from the spark plug wire to one of the coil terminals... 7~9k ohms.
With the coil disconnected, connect a voltmeter to the two coil wires. There should be a pulse of at least 11 volts from these wires when the engine is cranking. If not, and the stator checks are good, then replace the CDI.
Checking the Stator... unplug the five wires coming from the stator... the one three-way plug and the two separate plugs.
The yellow/blue wire should put out around 0.40 volts to ground when cranking. If not, replace the stator. The Black with red stripe (CDI charge wire) can be anywhere from 50~100 volts to ground when cranking, but will still charge the CDI enough to spark all the way down to 10 volts. Any lower then the stator is bad. Measure the stator's resistance. Unplug it and measure between the black with the red stripe and the green wire in the 3-way plug. The resistance should be 450 ~550 ohms. If not, then replace the stator. Lastly, the black wire with the white stripe, plugged into the CDI, should NOT be grounded when the key is on and the kill switch on the handlebars is in the middle position. If it is, then either the kill switch is bad or the ignition switch is bad.
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Post by pedez2000 on Apr 15, 2009 8:05:14 GMT -5
their is no way to test a cdi itself other then replacing it.
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Post by pedez2000 on Apr 15, 2009 8:10:03 GMT -5
i was trying to look up cdi yesterday too. and it needs four 4 letters or more.
i wanted to read up on the ac dc cdi box thing.
if anyone remembers that post. please put the link up. i can't remember if some of the newer cdi in the newer scooters are ac or dc.
i have a comppany sending me performance ac and dc cdi's to test.
but thats still weeks away.
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Post by medman1952 on Apr 15, 2009 13:23:49 GMT -5
If you need to search a topic with three letters use the google search at the bottom of the page. Don't forget to click the button to search scootdawg or you will get a web search.
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Post by edlinuser on Apr 15, 2009 14:48:44 GMT -5
A bone to you Skoot! Thanks for some great advice!
The stator is bad. I'm going to replace it but I think I'll also replace the CDI unit while I'm at it.
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Post by Skoot on Apr 15, 2009 18:01:57 GMT -5
A bone to you Skoot! Thanks for some great advice! The stator is bad. I'm going to replace it but I think I'll also replace the CDI unit while I'm at it. So do tell... what test did it fail? |
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Post by edlinuser on Apr 16, 2009 3:07:46 GMT -5
The black/red wire was less than 1 volt.
I've been over some rough roads. Maybe it's just loose.
I've got to get it opened up.
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Post by ar34 on Jul 5, 2012 20:00:06 GMT -5
I had a similar problem. Check the wires going to the coil. If the spade connectors are loose, chances are the CDI is fried. Check the resistance between the two coil terminals. It should be around 3 ohms. Now check from the spark plug wire to one of the coil terminals... 7~9k ohms. With the coil disconnected, connect a voltmeter to the two coil wires. There should be a pulse of at least 11 volts from these wires when the engine is cranking. If not, and the stator checks are good, then replace the CDI. Checking the Stator... unplug the five wires coming from the stator... the one three-way plug and the two separate plugs. The yellow/blue wire should put out around 0.40 volts to ground when cranking. If not, replace the stator. The Black with red stripe (CDI charge wire) can be anywhere from 50~100 volts to ground when cranking, but will still charge the CDI enough to spark all the way down to 10 volts. Any lower then the stator is bad. Measure the stator's resistance. Unplug it and measure between the black with the red stripe and the green wire in the 3-way plug. The resistance should be 450 ~550 ohms. If not, then replace the stator. Lastly, the black wire with the white stripe, plugged into the CDI, should NOT be grounded when the key is on and the kill switch on the handlebars is in the middle position. If it is, then either the kill switch is bad or the ignition switch is bad. OK, I suck at trouble shooting electrical... resistance between the two terminals is .3, guessing that is 3 resistance between the terminals and the wire is nothing?? while turning over I got real high readings 50-60 and down to like 6 after turning over a little while .06 volts on the yellow/black (not blue??) .20-.40 on the black/red reading 40-98 on the resistance between red/black and green So I am guessing that the Stator is bad, but not sure... and where is it? I am guessing the black square box is the CDI and not the stator. this is a 2009 50cc Huawin NX3 correct anything wrong, im new to scootin. and its for my son. My problems is NO spark with new plug. Wiggled some wires and it stalled and will not start. |
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Post by carasdad on Jul 5, 2012 21:52:24 GMT -5
i was trying to look up cdi yesterday too. and it needs four 4 letters or more. i wanted to read up on the ac dc cdi box thing. if anyone remembers that post. please put the link up. i can't remember if some of the newer cdi in the newer scooters are ac or dc. i have a comppany sending me performance ac and dc cdi's to test. but thats still weeks away. |
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Post by carasdad on Jul 5, 2012 22:39:39 GMT -5
their is no way to test a cdi itself other then replacing it. Sure there is....if you are getting power from the red wire on the stator...and no spark....test your coil resistance..if it is within normal limits....the CDI is bad... Attachments:
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Post by ar34 on Jul 6, 2012 14:27:01 GMT -5
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Post by ar34 on Jul 11, 2012 10:53:47 GMT -5
Still lookin for some help
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