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Mar 31, 2008 22:40:49 GMT -5
Post by mono500 on Mar 31, 2008 22:40:49 GMT -5
Hello.
On sr500 1979, the advance with the timing light is always on the F from 1000rpm and up.
I understood it was electronicaly control by the CDI.
Should I change the CDI ?
thank you
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Post by caferacercarl on Apr 1, 2008 3:22:43 GMT -5
At 3,000rpm if it still stays on F, and the bike is very unpowerfull, just get the stator tested. regards Carl, [ as the stator has windings for the advance and high speed]
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Post by mono500 on Apr 1, 2008 7:27:58 GMT -5
I just have the stator rewind by professional ( Canada )
May I check without to remove the flywheel ?
Test the stator in this case means the stator coil , pulser coil and charging coil, all three ?
Does my cheap little ohmeter (volmeter ) is fine for the job or I realy need a professional one ?
Thank you very much for your time.
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Post by mono500 on Apr 1, 2008 8:03:36 GMT -5
I checked the resistance of the stator coils, at the terminal ( between the tank and the battery ) as p105 Clymer book. Is it what I was supposed to check. I will recheck it , in a couple of days, with a better ohmeter.
It is a long time ago I did this type of work but I think at this point I can only rely myself.
I will let you know and thank you for your advice.
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Post by mono500 on Apr 1, 2008 8:05:07 GMT -5
By the way at 3000rpm, the bike looks very powerfull.
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Apr 3, 2008 20:31:19 GMT -5
Post by stevec5000 on Apr 3, 2008 20:31:19 GMT -5
Hello. On sr500 1979, the advance with the timing light is always on the F from 1000rpm and up. I understood it was electronicaly control by the CDI. Should I change the CDI ? thank you Yes, if it isn't advancing the CDI is bad. The only way to check it is by substituting a good unit. |
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Apr 6, 2008 18:32:52 GMT -5
Post by mono500 on Apr 6, 2008 18:32:52 GMT -5
Hello
I retested the stator with good equpment. It is fine. I ordered the austalian CDI, we will see. In case of succes I will let you know.
thank you
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Apr 28, 2008 16:50:36 GMT -5
Post by mono500 on Apr 28, 2008 16:50:36 GMT -5
Good, I received my australian CDI, Hyperpack S/N 108050. I have no spark at all with it and spark with the old one. I contacted Wayne who sell it on ebay for help. Maybe I should modified ( cut some plastic) the motorcycle plug ...
If anybody went through that, thank you to let me know
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Apr 29, 2008 3:39:33 GMT -5
Post by caferacercarl on Apr 29, 2008 3:39:33 GMT -5
As mentioned in a previuos ignition forum, the horseshoe in the centre of the stator winding controls the advance, the CDI has no advance function in the box, it is controlled by the stator which has 3 windings for the ignition RPM RANGE alone, strange bike the SR but one that makes us both respect it and love it......
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Apr 29, 2008 9:04:33 GMT -5
Post by stevec5000 on Apr 29, 2008 9:04:33 GMT -5
Carl, How can the stator winding control the advance? You say the stator has 3 windings for the ignition RPM RANGE but that doesn't seem possible since there are only 5 wires going from the magneto to the CDI unit but one is ground, one goes to the kill switch and one to the ign. coil which leave just 2 wires from the magneto to power the CDI unit. The magneto doesn't have any control circuitry built-in to control the advance and I don't see how it could control the CDI unit using just 2 wires for power so how does it do it? If you know how it works please let us know. BTW, my 750 Seca has the advance circuitry built into the ignition box and I suspect the SR500 does also.
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Apr 29, 2008 17:03:48 GMT -5
Post by wotavidone on Apr 29, 2008 17:03:48 GMT -5
Take a look at the circuit diagrams on other threads. It looks to me that the advance is controlled by current limiting resistors and stuff controlling the time taken to charge things inside the CDI.
Mick
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Apr 29, 2008 17:37:45 GMT -5
Post by stevec5000 on Apr 29, 2008 17:37:45 GMT -5
Does anyone know where the circuit diagrams are or how to find them?
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Apr 30, 2008 2:07:03 GMT -5
Post by mono500 on Apr 30, 2008 2:07:03 GMT -5
To Wotavidone.
Could you please point out which thread(s) you ae refering ? Thank you.
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Apr 30, 2008 5:21:18 GMT -5
Post by aero on Apr 30, 2008 5:21:18 GMT -5
I'm not an expert, but this system looks like it uses a network of inductors (the coils in the stator) as filters that are tuned to certain frequencies (engine RPM). As the frequency changes one set of coils filters its self out of the equation and the others take over. The effect of this will effect the charging time constant of the capacitor and hence the ignition timing. I think there is a thermal device in there to stablise it over temperature changes too. There is not timing device (expect a network of resistors that will effect the capacitor charging/discharging time constant) in this box! Someone tell me I'm talking bollox!  |
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Apr 30, 2008 9:23:03 GMT -5
Post by stevec5000 on Apr 30, 2008 9:23:03 GMT -5
I wish that I could read that but it's too small, and in German!
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