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Post by bawbag on Nov 24, 2020 0:17:20 GMT
Any advice or readings would be greatly received.
I suspect my generator is failing when it's hot.
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Post by buster on Nov 24, 2020 6:29:08 GMT
the easiest test for that is to put a multi meter on the DC20v range, fire the bike up and check the voltage at the battery terminals, should read about 14.4 from memory. otherwise its checking resistance figures at the stator itself (I'm a bit of an electrical plank, I'v never been any wiser after I'v checked resistance)
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Post by Chris P Duck on Nov 25, 2020 16:44:29 GMT
Do you or do you not have access to a motor scope or oscilloscope, a tv for electrics/electronics ?
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Post by andy1kenobe on Nov 25, 2020 17:45:53 GMT
Do you or do you not have access to a motor scope or oscilascope, a tv for electrics/electronics ? You can pick up old school scopes cheap on ebay these days, the sort of thing I used for my City and Guilds. Even the cheap Chinese TFT scopes and build your own kits for around £15 work surprisingly well. I remember reading the article in Car Mechanics about one of those kits that they tested on alternators and they praised it up. I was thinking of getting one myself. |
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Post by Chris P Duck on Nov 26, 2020 17:44:20 GMT
If you don't have the oscilloscope here is some simple trouble shooting.
Disconnect the cdi black/white wire and try again, no difference means ignition "kill" circuit is probably all ok.
Disconnect the CDI at the black and white wire and give it another try. If there is no difference then it means that the "kill" circuitry is probably all good.
Next remove the generator cover and check that the ignition advance is working as it should (smoothly and properly when cold and also when hot) no advance is quite normal when hot. Suggest make and break contact. Does system advance properly? Using relatively cheap red neon plug caps that "flash" when HT is produced, a visible means of checking "missing" HT.
Alternator stator resistance check cold and hot, check if there any large differences ? There will be small differences due to heat, but not much if all okay.
Generator AC Volts output cold and hot at 2 revs, idle and 4k plus. All voltages rise with revs, or do some outputs plummet to about 25 to 30 vac as, when the "misfiring" happens (assuming those are the symptoms) ?
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