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Sportster Motorcycle Air intake, Carburetor, EFI, Fuel, and Exhaust Problems, advice and/or how tos for Sporster and Buell motorcycle carburators, Electronic Fuel Injection (EFI), Air Intake, Fuel and Exhaust.

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  #91  
Old 1 Week Ago
juzyHD's Avatar
juzyHD juzyHD is online now
Senior Chief Harley Engineer 2nd Class
 
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Sportster/Buell Model: sportster 1200
Sportster/Buell Year: 1986
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Quote:
Originally Posted by LuxBlue View Post
The Cycle Electric regulator charges my battery to 14.4 VDC. The OEM regulator only charged to 13.9 VDC which I always thought was a little low.
My Shorai lithium ion battery reccomends charging to at least 14.34 VDC for 100% charge

I assume that his stock regulator wasn't working properly. My stock reg puts out around 13.8V at idle and my alternator puts out around 14.5 V AC at idle. As soon as I touch the throttle the voltage rises to 14.5V DC.We must know that later version have higher AC voltage at idle due to rpm reduction on models with alternator under the clutch ( I think that primary ratio is 1.74, so at 1000 engine rpm the alternator spins with only around 570rpm, if my math is right...).

AnotherMike have higher AC readings than me, but lower DC readings than me.
So there must be a problem with regulator or there is a bad conection somewhere in electrical circut.

There is nothing else, that came to my mind why he has so low charging.
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  #92  
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bustert bustert is offline
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740 seem better.
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  #93  
Old 1 Week Ago
juzyHD's Avatar
juzyHD juzyHD is online now
Senior Chief Harley Engineer 2nd Class
 
Join Date: Mar 2015
Location: Europe Slovenia
Posts: 1,657
Sportster/Buell Model: sportster 1200
Sportster/Buell Year: 1986
Reputation: 717912
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Quote:
Originally Posted by bustert View Post
740 seem better.
Help me out here, Bustert... isn't the formula rpm÷ratio? Like 1000rpm÷1.74..? My calculator sais it's 574.7 ...
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