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Post by lostforawhile on Nov 14, 2017 21:54:53 GMT -5
2stroked The pick up has the magnet, the flywheel has the metal, we are not talking about the inner magnets for the stator. lostforawhile I would suggest disabling the kill switch wire from the CDI connection. Should be the black wire with the white stripe. I'm measuring right off the pickup connection with nothing else connected, ground straight to the case, and guess what,a brand new pickup, and NO voltage, again, this is number 4, 140 ohms through the pickup to ground, but no voltage when the engine is turned over, gap is fine, but no dam voltage, there has got to be a magnet embedded in that flywheel, I can't see any other way it can generate AC with a single magnet and a piece of metal. This makes no dam sense
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Post by lostforawhile on Nov 14, 2017 22:07:37 GMT -5
OK one person says the mark isn't magnetized, the guys at rolling wrench,which is a huge motorcycle shop, say it is,others say it's the flywheel magnets that trigger the sensor by the metal timing mark on the outside of the flywheel. It's got to have something to do with the dam flywheel, I can't get any voltage out of any of these pickups, I don't have any more money for a dam flywheel, my truck is broke, my wife is in the hospital, and once again I have no transportation.
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Post by gsx600racer on Nov 14, 2017 22:39:36 GMT -5
lostforawhile Prepare to have your mind blown. Yes it makes power(or a pulse of power). You have a coil and a magnet(pick-up). When the 1/2" square rotates on the impact wrench, it changes the field that the fixed magnet is creating and acting on the coil of the pickup. Hence making AC power. Yes there is a magnet in the center of the pickup(see screw at the end of vid) Meter set to measure AC. The coil is triggered by the little piece of metal that's attached to the flywheel(highlighted in black), not the timing marks, not the magnets on the inside of the flywheel.
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Post by lostforawhile on Nov 14, 2017 23:55:52 GMT -5
thats what I meant by timing mark, I was referring to that
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Post by gsx600racer on Nov 15, 2017 0:24:24 GMT -5
thats what I meant by timing mark, I was referring to that It's called a "trigger"
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Post by lostforawhile on Nov 15, 2017 4:03:28 GMT -5
well it's down to the trigger and the pickup coil, this is the fourth coil, no damage to the flywheel, yet I still have no signal, the engine is spinning fast enough, the gap is fine, the coil is isolated, but i still dont have shit.
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Post by 190mech on Nov 15, 2017 4:04:56 GMT -5
Is your meter working properly?Have you reconnected everything and spark tested it??
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Post by lostforawhile on Nov 15, 2017 4:57:11 GMT -5
Is your meter working properly?Have you reconnected everything and spark tested it?? meter is fine, tried a different one too, same thing, and yes I spark tested it, nothing, this makes no sense
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Post by lostforawhile on Nov 15, 2017 10:23:41 GMT -5
Its got to be the flywheel, I don't know why, but I've isolated it to two parts, I just tested the pickup by using my lathe jaw to serve as a reluctor, and it works, but installed none of them work. It's a piece of metal plate,how in the hell? I know guys who have worked on these for 30 years and never seen a bad flywheel, but leave it to me to get the one in a million bad part. Also because someone is going to say it, the flywheel and crank run true, I already checked.checked it with a dial indicator
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Post by lostforawhile on Nov 15, 2017 14:38:25 GMT -5
I'm sitting here scratching my head still trying to figure out how the flywheel could possibly fail, but when you isolate it down to the pickup and flywheel and the pickup tests good, there is just nothing else, there must be some arrangement between the trigger and one of the flywheel poles, lining it up on a magnetic pole would help increase voltage at the pickup. When I get the new flywheel on, this one is going to come apart and I'm going to find out.
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Post by 190mech on Nov 15, 2017 18:18:37 GMT -5
I think I mentioned earlier about correct phasing of the pulse(pickup) coil to the source(cdi charge) coil,flywheel magnet phasing is also important..If an 8 pole stator is installed under a 6 pole flywheel,then the spark game is out the door..All the components must be matched(except in a DC CDI)..Hope you get that pesky Gremlin chased away soon!!
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Post by lostforawhile on Nov 15, 2017 19:55:06 GMT -5
Its an 8 pole stator and eight pole flywheel,just like original,stator part works great,but even with a phase problem, I would still read something off my voltmeter. I got .6 volts from my lathe jaws by holding it to the side of them, it's possible that both those who say it's magnetized, and those who say it's not, may be both right, there may be a gap cut under that trigger to allow a stator pole to influence it, but not be strong enough to feel magnetized, The reason for that would be a higher voltage and stronger signal
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Post by lostforawhile on Nov 15, 2017 19:58:35 GMT -5
Oh the volts to the cdi are fine, I'm getting 78 volts cranking ,it's just not triggering the ignition pickup
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Post by 190mech on Nov 16, 2017 6:21:07 GMT -5
Perhaps a member here could be good enough to send you some known working 139qmb iggy components for you to try on your scoot in order to isolate this problem.I'd gladly send you some ,but my garage has nothing but 2 strokes in it!!
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Post by lostforawhile on Nov 16, 2017 7:32:05 GMT -5
What I'm lacking right now is an 8 pole flywheel, everything else is good,new stator,which was bad due to the charge coil,I have a new Yamaha coil, and several cdi boxes, when I tested a couple of pickups yesterday they showed to be good, so it's isolated to the flywheel, nothing left in the circuit but the flywheel and pickup coil, and no voltage, gap is good,connections are good, 145 ohms.
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