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Help Me Fix It A great place to post any problems you may be having while working on your motorcycle. Most of us are do-it-yourselfers so this is a great way to share any information pertaining to fixing something or adding something on.

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Old 02-28-2010, 02:20 PM   #1 (permalink)
808built
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Default R6 wont start

I have a 2005 yamaha r6 that won't start. The battery is new and after a few days of running it, it wont start. The turn signals, horn, lights, and accessories work fine in the run position and as soon as I try to start it, the bike turns over very weakly and then stops. You can only hear the starter at this point. I kick started the bike and tested the battery with a voltmeter when it dropped down from 12.5 volts, to 11, to 10, 9, then 8 when the bike finally shut off. I'm not sure what the problem may be. I was thinking the alternator or maybe a grounded wire somewhere? Any comments or advice would help...
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Old 02-28-2010, 02:38 PM   #2 (permalink)
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Its not in the not run position on the right handlebar right? first things first.
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Old 02-28-2010, 02:49 PM   #3 (permalink)
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No its not. I turn it to the run position and try to turn it on. Cranks maybe once or twice but then dies. Afterwards you can only hear the starter engaging but motor doesn't turn over. If I push start the bike it runs but then dies after the voltage on the battery continues to drop. Ill have to keep on the throttle for it to stay on.
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Old 02-28-2010, 03:11 PM   #4 (permalink)
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you will have to gt a schematic for specs, but id say there is something wrong in your charging system, you will need to know what wires to test for your bike, but you will have to work your way from the stator all the way to the battery, check for loose wires, connections, and test each unit in the system.
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Old 02-28-2010, 04:55 PM   #5 (permalink)
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Check out put voltage at regulator, should be 14.7VDC at 5 K rpm. If not check input voltage to regulator, 3 wires, should be 50+VAC at 5 K rpm. If AC voltage is ok then you regulator is toast. If AC voltage is low the stator is toast.
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Old 02-28-2010, 06:10 PM   #6 (permalink)
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I knew it was the charging system just didnt know what to check. Im trying to get the schematics so i know what to check. Thanks guys
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Old 02-28-2010, 09:51 PM   #7 (permalink)
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you can download the service manual for free.
http://www.r6messagenet.com/forums/p...ice_manual.pdf

the 05 suppliment to the manual,
http://www.r6messagenet.com/forums/pdf/2005R6supp.pdf

and here is how you test the R6 charging circuit.

it has to be at least 14v at 5k rpm. minimum. in my experience from being around R6 forums since 2003, it's most likely just a bad regulator or a burnt plug at the regulator. (the regulator on the R6 is visable by looking right by where the rear shock mounts. it's a black box that has fins on it.
there is no specific test that the manual has. it just says to check everything else and then replace it.


Last edited by serpentracer; 02-28-2010 at 09:55 PM.
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Old 03-01-2010, 05:58 AM   #8 (permalink)
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Quote:
Originally Posted by 808built View Post
I knew it was the charging system just didnt know what to check. Im trying to get the schematics so i know what to check. Thanks guys
Follow the wires from the alternator cover to where they go into the regulator. This is the AC voltage check location. The wires going out of the regulator to the battery is the DC voltage location. Reading the manual is best but this is a time proven method that works.
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Old 03-01-2010, 09:20 AM   #9 (permalink)
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Also, just for your peace of mind... fully charge the battery and load test it to ensure it is working properly. Just because the Battery is brand new, does'nt mean it is in perfect working order.
It does sound a little like a voltage regulator problem. (bad diodes causing drainage of the battery)
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Old 03-02-2010, 12:59 AM   #10 (permalink)
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Ok sorry for the false information. My friend told me it was brand new but when I asked him again he said it was new when he bought it but had been sitting for a while. The battery does not hold the charge at all. It dropped below 6 volts after an hour of it being properly charged. I jump started the bike and reved the motor to 5k. It climbed from 8 volts from idle to 12 volts at 5k. I know it should be 14 so could it still be the battery?
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Old 03-02-2010, 05:52 AM   #11 (permalink)
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The battery could be placing a high load on the charging system.
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