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Post by dejavu165 on Mar 15, 2017 21:09:40 GMT -5
I've got a scooter that isn't giving me spark. Normally Ive been able to get spark on my regular ac scoots.. But this one is dc. I replaced the coil and the plug is good. I took the stator out, cleaned it and checked it for any breaks. Wasn't too sure how to test the stator or the cdi. I got a reading from the one wire off the cdi of some low dc voltage. Does anybody have any experience with any of this dc stuff? Also weirdly when I turn the key on the spark plug will spark once when I hold it against the motor.. Weird.
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Post by dejavu165 on Mar 15, 2017 21:58:50 GMT -5
This is for my gy6 if that wasn't obvious.
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Post by gsx600racer on Mar 15, 2017 22:31:26 GMT -5
This video might be helpful.
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Post by dejavu165 on Mar 15, 2017 22:59:53 GMT -5
Ya Ive seen similiar videos to test the stator. But he doesn't mention anything about a scooter with a DC Stator. My DC stator only has a pickup wire. So maybe ill double check my voltage readings on that tomorrow.
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Post by spaz12 on Mar 16, 2017 1:25:39 GMT -5
Do you have a fully charged battery? Apparently most DC CDI powered scoots need a fully charged battery.
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Post by dejavu165 on Mar 16, 2017 7:06:20 GMT -5
Brand new battery. Ya I guess it gets it juice more from the battery. I think the previous owner tried jumping it with his car. So maybe he fried the CDI. I've got a new one coming so we'll see. The stator has 12 pole and I can only find 11 pole stators online
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Post by 90GTVert on Mar 16, 2017 10:19:20 GMT -5
You can still try the pickup checks in the video, but you need to look for 12V + when the key is switched on instead of finding out if the stator is outputting AC to power the CDI. Most have a 4 terminal and 2 terminal connection on the CDI. The 12V power should be the single wire in the 2 terminal connector.
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Post by gsx600racer on Mar 16, 2017 16:20:23 GMT -5
Your scooter may have a DC CDI, but your stator is still AC based. So instead of you CDI being powered(or excited) by your by the stator(AC), your CDI is powered by the batter. The AC power thats created by the stator is sent to the voltage regulator and converted to DC to charge the battery.
So the tests would be the same in the video.
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Post by dejavu165 on Mar 17, 2017 17:25:02 GMT -5
When I test the one jumper wire (2 pins at the cdi, one wire) with the key on I get 11.7 volts. And if I crank it I get about 10.5 volts. Should it be at least 12 volts then?
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Post by gsx600racer on Mar 18, 2017 0:43:30 GMT -5
You are always going to have voltage drop when starting the scooter.
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Post by dejavu165 on Mar 18, 2017 9:52:11 GMT -5
So my CDI is fine then? But the stator could still be under powering the cdi?
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Post by gsx600racer on Mar 18, 2017 11:53:53 GMT -5
So my CDI is fine then? But the stator could still be under powering the cdi? No, the voltage drop is from you trying to start the scooter, the starter uses power from the battery(load) hence voltage drop. Have you tried a different CDI ? |
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Post by 90GTVert on Mar 19, 2017 13:30:23 GMT -5
Your battery power is a bit low, as it would ideally be over 12.5VDC. I would think you have enough voltage there to get it to start. You could try a spark tester with a wide gap to see if the spark still crosses it and looks strong (blue/white/purple not yellow/orange). Pickup coil output should still be similar to what the video shows, roughly 0.5V. Also weirdly when I turn the key on the spark plug will spark once when I hold it against the motor.. Weird. Are you saying it does this without even cranking the engine over to try to start it? If so, something must be shorted. |
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Post by dejavu165 on Mar 20, 2017 19:36:02 GMT -5
I got my new CDI today and tested it with the same results. Ya just when I turn the key on it the plug will spark once. Not sure where to go from here.
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Post by oakleyscoot on Mar 20, 2017 20:09:39 GMT -5
This is how I understand DC cdi boxes (generally speaking)...
The 12v supplied by the battery initially charges the cdi and makes it ready to fire the coil.
When it receives a signal from the pickup coil ( metal tab passes by or in vicinity of pickup coil)
this pulse triggers the cdi and causes the coil to fire.\
The fact that your getting a single fire when turning on the ignition key suggests something must be amiss
with your wiring.
The fact that at this point the crank shaft is not turning, your pickup coil cannot be sending
the signal to fire the coil yet your getting a single spark.
This tells me that the cdi thinks its getting a signal from the pickup coil thus it fires the coil.
Yet when the crank is actually spinning no signal triggers the cdi.
Has anything been done to the wiring that you are aware of ?
double check the wiring on cdi box as one wire if followed should lead back to the pickup coil at the flywheel.
maybe you can post a picture of the cdi with a list of which wires on the cdi and where they go.
This will help us with diagnosing your problem.
my .02¢
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