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  #1  
Old 2 Weeks Ago
staniel's Avatar
staniel staniel is offline
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Default Battery generator problem?

It's always something... I took my '71 XLCH for a ride last Saturday which was basically the first full day I got to ride it.

I pulled into a gas station for a second to chat with my buddy, but as I started to pull away, the bike died as I gave it gas. After it died, it started leaking fuel out of the air cleaner.

I wasn't too surprised at the leaking gas. I figured some rust clogged the float bowl valve - which is brand new because I got a rebuild kit for my Super B. I did also hear a weird pop noise as I blipped the throttle when I downshifted as I pulled into the gas station. Maybe it was a carb fart? It sounded like a balloon popped.

After waiting about 10-15 minutes for some fuel to evaporate, I couldn't start the bike. The battery had 12.25V which is weird because I was riding for about 25 miles straight. That would signal that the generator isn't charging the battery when it runs, correct?

I had to tow the bike home -___-
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Compression, Fuel and Spark - Verify each...

Pull the plugs & look for spark when you kick it over...
You know you have fuel - Is it getting there correctly?
Do a check on the compression - Do you have a reference PSI from prev check?

Once you have it running again, then check the voltage across the battery to see if it's charging - Do you have a Gen Light? Did it come on?

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  #3  
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staniel staniel is offline
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Quote:
Originally Posted by IXL2Relax View Post
Compression, Fuel and Spark - Verify each...
Pull the plugs & look for spark when you kick it over...
You know you have fuel - Is it getting there correctly?
Do a check on the compression - Do you have a reference PSI from prev check?

Once you have it running again, then check the voltage across the battery to see if it's charging - Do you have a Gen Light? Did it come on?
I was riding the bike for about 25 miles, so I would hope it had compression, fuel, and spark! Hahaha but it's my understanding that 12V batteries are considered dead at 12.4V and are considered fully charged at 13.5V. The battery was at 13.5V when I started running, but 12.25 when it died. The generator light did not come on at any point I was riding, but that's not to say that light works...
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Quote:
Originally Posted by staniel View Post
The generator light did not come on at any point I was riding, but that's not to say that light works...
The NON-INDICATOR light ---- LOL!!!

Recharge the battery - Check for full charge (after resting it for 1 hour)
Try starting it again - Measure the voltage after it's running...


AGM Batteries
Voltage Reading ... 12.7 . 12.6 . 12.3 . 12.0 . 11.8
Percent Charged ... 100% .. 75% .. 50% .. 25% ... 0%

Older-style Sealed Lead Acid Batteries 9)
Voltage Reading ... 13.0 . 12.8 . 12.5 . 12.2 . 12.0
Percent Charged ... 100% .. 75% .. 50% .. 25% ... 0%



Measure voltage across the battery terminals
1) With the keyswitch off
2) With just the keyswith ON
3) When cranking the bike
4) When the bike is running - about 2000 rpms
5) Ride 10 miles - Check it again while running

Report back...

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Last edited by IXL2Relax; 2 Weeks Ago at 16:27..
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Quote:
Originally Posted by IXL2Relax View Post
4) When the bike is running - about 2000rpm

Report back...
This one is especially easy to do on the side stand. As you rev the engine, you should see an increase in voltage to the battery and it should max out at a little over 13 volts. If it goes over 14, that could be a problem too.
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The Doctor71 The Doctor71 is offline
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Are you running points or electronic ignition ? 12.25v should be enough for just the coil/points to operate on a stock '71 xlch ignition. So I guess you have electronic..... but ?

Your battery dropping from 13.5v to 12.25v is not a good sign. Something is toast.

Does your GEN LIGHT come on with the motor stopped & key on ?

It should (provided your battery has that 12.25v you described). If not, your GEN LIGHT is non-functioning & you'll want to address that.
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Points, unless electronic ignition has been installed in the last 2 weeks: http://xlforum.net/forums/showpost.p...8&postcount=25
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You said it wouldn't start. Could be a cylinder filled up with gas and it hydro locked.
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with points ignition, anytime my bike runs well for a spell then suddenly acts up i check that the points gap hasn't closed up and that the point contact faces aren't severely burned and pitted. have you gotten it to run since last saturday?
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Quote:
Originally Posted by staniel View Post
I did also hear a weird pop noise as I blipped the throttle when I downshifted as I pulled into the gas station. Maybe it was a carb fart? It sounded like a balloon popped.
that's the sound of the ignition trying to fire with a discharged battery.i've heard it before.
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