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Post by lostforawhile on Nov 10, 2017 17:36:38 GMT -5
ok this is bizarre, I have two ignition pickups that don't work, both read 146 ohms, I know one is good, as it's the one I drilled the holes in slightly bigger to move it closer to the flywheel, and it was running on that, is the pickup point on the outside of the flywheel supposed to be magnetized? or does it create an effect like a hall effect sensor? I know I have continuity on the sensors, as I checked them installed, yet when I spin the engine over I have no voltage output, they are close enough to the flywheel pickup point. one of these sensors did work, as I had voltage out with it, I know it's pulsing DC at the pickup vs AC at the stator outputs, yet now nothing, is this thing somehow demagnetized?
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Post by lostforawhile on Nov 10, 2017 17:50:18 GMT -5
I did check it on AC too, and zip on both
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Post by lostforawhile on Nov 10, 2017 19:15:58 GMT -5
anyone? I have to figure this out, my truck is down and I have no other transportation,
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Post by AtariGuy on Nov 10, 2017 19:57:06 GMT -5
Yes they are hall type pickups
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Post by 190mech on Nov 10, 2017 20:03:55 GMT -5
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Post by lostforawhile on Nov 10, 2017 20:17:43 GMT -5
That's what I was thinking but I wanted to make sure, one of these pickups is known to be good,but no voltage, I'm using my good fluke, so I know it can read that low of a voltage, it had no issue reading it before. This is odd, the pickup is close enough,the resistance is good on both,but no output. I checked continuity on both installed. It's turning plenty fast enough. New battery,cables,and starter, charge coil output is like 70 volts.
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Post by lostforawhile on Nov 10, 2017 22:25:47 GMT -5
anyone know really quick what the pickup gap is supposed to be? I get 0 volts ac then suddenly get like .2 volts then 0 volts again while cranking. I had already made the holes larger to move this pickup closer, so either my gap is wrong, or I've got three defective pickups, sadly with my luck it's probably the pickups, if the Harley guy who has the voodoo doll of my scooter is reading this, please stop sticking pins in my ignition. I hope mud daubers invade your carburetors and squirrels infest your wiring harness
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Post by 190mech on Nov 11, 2017 5:32:03 GMT -5
I dont think the gap is super critical,for the external adjustable types on motorcycles we'd put a business card between them and let the pulse coil suck down to the flywheel,then tighten it..Are you checking this in circuit?If so perhaps a faulty kill switch could be snuffing it..
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Post by lostforawhile on Nov 11, 2017 9:48:22 GMT -5
I dont think the gap is super critical,for the external adjustable types on motorcycles we'd put a business card between them and let the pulse coil suck sown to the flywheel,then tighten it..Are you checking this in circuit?If so perhaps a faulty kill switch could be snuffing it.. out of circuit , right from the stator
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Post by greginisn on Nov 12, 2017 1:54:07 GMT -5
About .030” gap for pickup coil should do you nicely.
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Post by lostforawhile on Nov 12, 2017 2:12:56 GMT -5
Even with the correct gap, no output, and that's with three different pickups, this makes no sense, what are the odds on three being bad? From someone who understands electrical really really well, and mechanics, this is baffling, there is no damage to the flywheel. It's just a piece of metal spinning under a coil of freaking wire,with a magnet in it,how difficult can it be?
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Post by 190mech on Nov 12, 2017 4:16:27 GMT -5
What about grounding,is the engine grounded to the frame??
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Post by lostforawhile on Nov 12, 2017 4:26:41 GMT -5
What about grounding,is the engine grounded to the frame?? yea it's all good, I'm measuring right off of the output wire of the pickup and directly to the case for ground, all of them measure about 145 ohms installed and bolted in place
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Post by lostforawhile on Nov 13, 2017 22:40:22 GMT -5
The mags in the flywheel still strong?/ Or would weakened magnents cause this? I mean IDK. thats what I would have thought, but apparently the timing mark on the outside of the flywheel isn't magnetized, it just has sharp edges that cut the field of the permanent magnet when it passes under it, the leading edge for one direction of current the trailing edge for the other, so it does produce ac as it rotates
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Post by lostforawhile on Nov 13, 2017 22:43:06 GMT -5
My wife is in the hospital, so I just got back, after i rest a bit, I just got another stator and pickup from them, so I'll swap the pickup since the rest of the stator is good, tired of walking to 12 miles round trip to work and 7 miles to the hospital
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