Ignition Coil Voltage

Maestro, SEI-V

Re: Ignition Coil Voltage

Postby dalorian » 10 Jul 2017 07:03

Well, after doing Evguru's test I was a little disappointed that I could not find anything obvious but then I checked the plug wires just to be sure and they are both zero ohms and seem very solid. Blue wires also seem to be very well grounded under the tank. I will check the AC voltage coming out of the green ignition wire while just normal cranking . What should it be while just normally cranking with the spark plugs out ? I have been just cranking it with an external battery with no plugs in it and I get 35 volts AC but It might tell me something if I just crank it normally . If it is so low that there may not be enough voltage to make a spark so if there is a normal voltage while just kick starting what would it be ? That will tell me something. Thanks , all, for your help.
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Re: Ignition Coil Voltage

Postby 72degrees » 10 Jul 2017 09:37

I'm pretty sure I get more like 50V AC at kickstand speed (well peaking at that). Given the reasonable resistance for the winding, perhaps the rotor magnetism is down, but I would expect at least a weak spark then.
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Re: Ignition Coil Voltage

Postby dalorian » 12 Jul 2017 22:56

Well, now , I am getting about 45 VAC peaking now and a spark. I have learned not to trust the electric starter . I don't know but maybe the battery was just not strong enough voltage wise to get it cranking fast enough even though I did not have the plugs in it but when I kick start it , there is a faster speed and in turn a spark . I am cleaning the gas tank right now to put some gas in it but I probably have to go through the carbs first. Thanks
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Re: Ignition Coil Voltage

Postby 72degrees » 13 Jul 2017 07:15

Still sounds as if the ignition may be below par. They will usually fire up ok on the e-start so long as that is gripping and turning the motor over properly. Progress though!
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Re: Ignition Coil Voltage

Postby MickeyMoto » 13 Jul 2017 12:02

My old 500 was the same. Starter made clonking noises and would only start warm. Changed the battery for a Yuasa and bingo! Needs a good battery to spin up the engine. Shows how good a kick start is.
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Re: Ignition Coil Voltage

Postby dalorian » 01 Oct 2017 00:23

I'm stumped , I lost spark altogether when I took the flywheel off and checked out the coil . All I did was to clean the rust off from the ignition coil so that it would not provide resistance . I reinstalled the flywheel and held the spark plug and cranked like mad but couldn't even feel a tingle but I'm getting 52 volts AC out of the coil directly . I checked everything out again with the light bulb on the boxes again but all checked good. I have never been stumped like this before on a motorcycle .
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Re: Ignition Coil Voltage

Postby dalorian » 01 Oct 2017 00:50

Okay , just now I hooked everything up again after checking the boxes with the light and also checking the pickups with the light . It turns on and stays on just like the test on the You tube video . Now just for the heck of it , I took the spark plugs out and held the spark plug electrode and cranked it as fast as I could , i got 53 volts AC as a peak on my meter but could only feel when the spark plugs were firing. I could tell each time the plug would fire but nothing really hurt me. If anyone could just hold theirs like this and let me know how it feels it would really benefit me . Just kidding, but that's where I'm at.
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Re: Ignition Coil Voltage

Postby adrianb » 31 Oct 2017 12:58

Did you find out what the problem was? I've got a similar issue myself after a re-build.
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