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[Help] with my '73 DT3 250, having ignition issues
- MarkT
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Replied by MarkT on topic [Help] with my '73 DT3 250, having ignition issues
All I remember from college vaguely is "right hand rule" and "left hand rule" where you use your curved fingers to point in the direction the wire is wrapped around the core and your thumb then points in the direction of electron flow or something like that.
Another thing that definitely could cause an issue with the "pulse timing" is where the stator coil is mounted on the stator plate. Did you bolt the ignition source coil back in the exact same position on the stator that it was removed from?
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- Sneezles61
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Replied by Sneezles61 on topic [Help] with my '73 DT3 250, having ignition issues
Sneezles61
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- MarkT
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Replied by MarkT on topic [Help] with my '73 DT3 250, having ignition issues
He said more modern systems are simply an fixed output alternator designed to put out plenty of power to run an electronic ignition and lights... then electronics are used to store and/or regulate any excess output... more like a car alternator than the "magic" used before semiconductors became cheap and available.
The fact that these early mags aren't loaded down with electronic components is what makes them reliable as a rock... you might get lucky changing the way it was built (even something like rewinding coils for 12v light output can impact the points magneto ignition system) or you might end up with a strange problem.
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- AirborneSilva
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Replied by AirborneSilva on topic [Help] with my '73 DT3 250, having ignition issues
1976 DT400C
1981 DT175H
1972 DT2 250
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- MarkT
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Replied by MarkT on topic [Help] with my '73 DT3 250, having ignition issues
I've just been rambling on about how simple these systems seem but are sensitive to "design changes". Paying attention to all the little details is important once you start "rebuilding" a stator. Lots of "hidden engineering" in these ignition/charging/lighting systems.
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- 19stuberd
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Replied by 19stuberd on topic [Help] with my '73 DT3 250, having ignition issues
Bad news! Reversed the wires, now it won't spark in either direction. AWESOME! I'm sure you're all pretty damn tired of this thread and I don't blame you at this point. I am trying to stay upbeat, here's ,my plan:
+Get the good flywheel puller. Gonna have to do this a lot, might as well do it right.
+Revert the wires to original positions, put it on, see if it behaves as expected. If not, maybe I messed something up when I did my soldering, there was some sketchy wires in there.
+If the reverted wires behave as expected, I will use the spare source coil core and wind a new coil in reverse. Put it on, check what happens.
+If still no luck, I'll take it all back to the oscilloscope / hyper-precise multimeter and see what's going on.
*also, I will take a look at the oscilloscope readings from this most recent stage, even though I don't think anything new is in there.
Any input is GREATLY appreciated. I'm pretty down in the dumps. Ask your neighbor for their advice, say a prayer, ask your dog, whatever you can. Thanks again guys.
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- 19stuberd
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Replied by 19stuberd on topic [Help] with my '73 DT3 250, having ignition issues
Also checked the manual again and you guys are right, it's supposed to be 3.2mm. I think I was looking at the RT3 by accident. This might be convenient though because there's a suspicious wire connection that routes under the points that I wanted to investigate but I didn't want to mess with the points timing, but this gives me an excuse to do so. We'll see what happens after I revert the wiring to its original state.
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- AirborneSilva
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Replied by AirborneSilva on topic [Help] with my '73 DT3 250, having ignition issues
1976 DT400C
1981 DT175H
1972 DT2 250
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- 19stuberd
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Replied by 19stuberd on topic [Help] with my '73 DT3 250, having ignition issues
Also I would certainly consider sending it in to be redone but I do actually enjoy the electronics bit I would say, I think it's all within my skill range (erm... if you ignore the backwards coil lol) for the most part.
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- MarkT
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Replied by MarkT on topic [Help] with my '73 DT3 250, having ignition issues
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