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Post by jackbo on Jul 29, 2021 11:38:13 GMT -5
Hello,
I got a SYM Fidlle II and I believe my Stator is bad. I wanted to order one online but there seem to be DC and AC stator. Anyone knows which one should I go with (I'll order one with 8 coils as the original).
Thanks in advance.
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Post by aeroxbud on Jul 29, 2021 17:50:00 GMT -5
Generally if it's AC it works off the stator. So unless the bikes running, the headlight won't work. DC, if the ignition is on, the headlight will be illuminated. 🙈
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Post by jackbo on Jul 30, 2021 18:44:30 GMT -5
Thanks! So looks like I got a DC stator then.
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Post by snaker on Jul 31, 2021 12:20:56 GMT -5
Well, the AC/DC label is generally referring to the stators ignition power capabilities. The stator coils are always AC output The lighting coils are AC and usually run everything except the AC ignition (DC ignition is run from the lighting system)
AC stator: the AC lighting coils plus a separate AC ignition power coil (sometimes 2 coils, the wrapped ones) DC stator: the AC lighting coils but no AC ignition power coil (all coils contribute to the lighting system)
So a DC stator works with a DC ignition by default cause there is no AC ignition power coil.
A machine can run with a DC ignition and a AC stator by simply not using the AC ignition power coil (wire not hooked up)
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Post by snaker on Jul 31, 2021 13:52:17 GMT -5
Had to step out to run the grill. I dug up some info: left side of page, sym fiddle III, seemed like the others This shows a AC powered ignition. Blk/rd wire from stator to CDI You need a AC stator because of this. This shows you have the dual circuit lighting system The yellow wire taps off the middle of the lighting coils (low power) It gets regulated only and runs some lights The white wire taps off the full lighting coils (high power) It gets regulated and rectified for charging and anything else
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Post by jackbo on Aug 1, 2021 12:14:31 GMT -5
Snaker, thanks for looking into it. Hope the food was good! I do believe my stator/DCI are DC though: 1- My CDI has 6 pins (a block of 4 pins and then a block of 2 pins on the right). For the block of 2 pins, there is only 1 used wire (red/black), rather than 2 as you showed on your picture for the Fidlle III (I don't have a black/white wire going from the kill switch to the CDI). 2- I also found a wiring diagram of the Fidlle II online, that also confirms the wires I have on my scooter (https://www.manualslib.com/manual/872680/Sym-Fiddle-Ii-50-Sym-Series.html?page=176#manual). You can use the magnifying lens to zoom in.
Here is a picture of my stator by the way, looks like there is only AC coils, but correct me if I'm wrong.
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Post by snaker on Aug 1, 2021 14:13:45 GMT -5
Snaker, thanks for looking into it. Hope the food was good! I do believe my stator/DCI are DC though: 1- My CDI has 6 pins (a block of 4 pins and then a block of 2 pins on the right). For the block of 2 pins, there is only 1 used wire (red/black), rather than 2 as you showed on your picture for the Fidlle III (I don't have a black/white wire going from the kill switch to the CDI). 2- I also found a wiring diagram of the Fidlle II online, that also confirms the wires I have on my scooter (https://www.manualslib.com/manual/872680/Sym-Fiddle-Ii-50-Sym-Series.html?page=176#manual). You can use the magnifying lens to zoom in.
Here is a picture of my stator by the way, looks like there is only AC coils, but correct me if I'm wrong.
From your photo and diagram I would say you are right. You can confirm the photo: Count the wires coming off the stator, not including the trigger circuit and follow connections to the coils. If no coil is isolated from the rest than it wouldn't be a AC ignition power coil. The diagram shows that as well.No circuit between stator and CDI, CDI gets power from the main switch.
Lighting coil: the diagram shows that you do have the dual circuit, half wave, single phase.Important for the replacement stator.I see the yellow and white wire connections, the third connection at 4 o'clock seems to be connected to a frame grounding tab for the stator mount only with no wire? If so than the lighting coil ground is only through frame ground. That might be odd since most will include a ground wire, usually green. Can be worked around if necessary.
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Post by jackbo on Aug 6, 2021 13:54:31 GMT -5
Sorry for the late reply, I've been caught up with other projects.
And you are right, my stator only has 3 pins: - a yellow to charge the battery - a white to charge the battery - a white/blue that triggers the CDI
So indeed, the stator must be grounded through the frame.
By any chance, do you have any idea of the kind of voltage I should expect on the white/blue wire (that triggers the CDI) when cranking the engine? My scooter does not produce any spark, but I'm still getting around 0.5/0.6V when cranking on that wire, and according to some youtube videos, this is what I should get.
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Post by steve1297 on Aug 11, 2021 14:37:33 GMT -5
.5v is about right for the trigger wire.
Your ignition system runs off your battery. So check and make sure the CDI is getting 12v from the battery. Make sure your battery is good, of course. Then check the spark plug coil and spark plug.
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Post by jackbo on Aug 18, 2021 18:14:59 GMT -5
.5v is about right for the trigger wire. Your ignition system runs off your battery. So check and make sure the CDI is getting 12v from the battery. Make sure your battery is good, of course. Then check the spark plug coil and spark plug. Thanks. I do have 12.4V at one of the the CDI input. Do you have any idea of the voltage I should get at the CDI output (to the spark plug coil)? Trying to diagnose if the CI could be faulty.
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Post by jackbo on Aug 23, 2021 14:31:16 GMT -5
Ok, so I've changed the CDI and the scooter is sparking (and starting) again. Thanks again for the help everyone.
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