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Post by ridecheap on Oct 29, 2012 13:38:50 GMT -6
New battery inside that is fully charged. I put it in and revved the engine its not charging up staying at 11.9 DC Volts. It must be the stator or regulator. I am thinking its the stator?? Any ideas.
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Post by Bashan on Oct 30, 2012 5:06:43 GMT -6
Those test values are coming in pretty hinky so I'm not sure you're getting correct readings. I don't think you'd be getting the DC voltage that you are with those readings. By the way, 11v DC is too low, my Fashion puts out 14 even at idle. So maybe you should try testing the "legs" of the coils by running the following tests before you order anything.
Your link to the three phase motor stator isn't quite the same as a 250cc scooter's stator. The coils for each phase on the motor are seperate windings and have no connections within the motor. On a three phase scooter stator they have a connection with each other. Here is a diagram of the stator, from the Linhai manual if I remember right:
You can see the connection of the three yellows within the stator. So you can indeed test the voltage from one yellow wire (leg) to another yellow (leg) and get an AC voltage. You do this with the connector unplugged and on the stator side of the connector. Test each pair of yellows until you cover all combinations. The voltages should be just about the same and 60v AC+ with some RPMs. If one yellow pair is markedly different from the others or not 60+ the stator is toast.
Another test you can perform is check the ohms between the yellow wires by checking two "legs" a time until you've did all the combinations. You should get around one ohm. If you can't get a reading, or the ohms are higher, a coil is shorted and you need a new stator. Also check continuity from each yellow to ground. There should be no continuity to ground and if there is the stator is shorted and you need a new one.
If the stator tests out correctly then you need a rectifier/regulator. Something is definately wrong though, 11v DC at the battery is weak.
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Post by ridecheap on Oct 30, 2012 10:23:16 GMT -6
You can see the connection of the three yellows within the stator. So you can indeed test the voltage from one yellow wire (leg) to another yellow (leg) and get an AC voltage. You do this with the connector unplugged and on the stator side of the connector. Test each pair of yellows until you cover all combinations. The voltages should be just about the same and 60v AC+ with some RPMs. If one yellow pair is markedly different from the others or not 60+ the stator is toast. Postive the stator is TOAST. I put these results down from the unplugged on the stator side of the connector in AC. Bottom wire with Right wire: .2 AC Bottom Wire with left wire: 20.-40. AC left wire with right wire: .1 AC The only wire putting out any AC when unplugged is the bottom wire. The only charge it takes is the bottom to the left wire and its only 20 AC. My stator is shot big time  With the plug pluged into the regulator and testing the three wires in DC its only putting out 5.4 DC volts on two of the three wires... I think the regulator is working fine because it is converting the AC to DC. |
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Post by Alleyoop on Oct 30, 2012 11:14:10 GMT -6
Yep, looks like the stator is toast, good job ridecheap,
Alleyoop
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Post by ridecheap on Oct 30, 2012 14:15:15 GMT -6
Ok thanks so is the stock stator aka magneto 18 coil or 11 coil? I
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Post by ridecheap on Oct 30, 2012 14:42:08 GMT -6
Here is a good video of a Roketa 250b strip down: You should save that one: Here is the a pic in the video of the flywheel etc this is not my scooter:  |
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..BAD TO THE BONE..