Question about 2003 Yamaha YZF-R6

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The bike does not start on its own. yet the battery has full voltage.

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Weak starter, worn brushes or weak carbon springs

need to check voltage drop when cranking

anything less 9.5v is rebuild time

Posted on Apr 20, 2009


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Posted on Jan 02, 2017


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100% - 30% even if i dont start the bike and just turn the key with a full charge all gauges etc work perfect 10 - 20 seconds i turn key off and same thing battery 100% - 33%??????????????

The battery should be removed from the bike and charged and tested for voltage, specific gravity if possible and current discharge.

The details you gave suggest a faulty cell. Even a modest-sized battery stores sufficient current to destroy itself and generate quite a lot of smoke if it really lost 70% of a full charge charge in 20 seconds.

Oct 22, 2016 | Motorcycles

1 Answer

2005 kingquad 700 battery not charging and fi light is on, fuel pump only coming on sometimes

Charles, What is the voltage of the battery without the motor running? What does the voltage go to when trying to start the bike? Once the bike is started what is the voltage?

On a good battery you should have 12-13 volts without the bike running. When starting the bike your voltage should not drop below 11 volts. After the bike is running your voltage should be somewhere between 13-15 volts. All of these readings should be taken at the battery posts. Also if you have individual caps on each of the openings of the battery check your water level. It should be to the upper line if not fill with distilled water.

If after starting your bike and the voltage is still low make sure both ends of each battery cable is clean. If clean your problem sounds like the charging system and you might need a new generator.

Apr 17, 2014 | 2001 Suzuki Burgman 250

1 Answer

Battery not charging

It shows full voltage while running because its circulating the power. If its not charging, depending on the bike you have, its the stator or regulator. These are basically the alternators for bikes. Just take it to a shop and theyll usually check it for free. It will just drain the battery everytime you run it until you get those replaced

Mar 31, 2014 | 2006 Hero Honda Passion Plus

1 Answer

On a 2009 Triumph America won't start with good battery. Disconnected single wire from Starter when start button pressed get battery voltage to wire. When connected just click. Do I replace the wh

Hey MArk,
Reinstall your starter...when trying to start your bike, voltage means almost nothing! - The "quality" of a battery is determined by the CCA (Cold Cranking Amps).. amperage is what makes your bike start...and you need at least 13.5 volts to run the lights, etc..
O'Reilly's, AutoZone, etc.. can test your battery..
..When you get a new need to check the charging system.. crank it up..let it get warm..then put a multimeter to it..Red to + terminal and black to - terminal should get 13.5+ volts DC to the battery at 3500 rpm..

Sep 20, 2017 | 2008 Triumph America

1 Answer

2008 R6. Battery discharges completely when allowed to sit. Owner replace four batteries. Voltage checked with bike at 5000 RPM and is charging (14.4 V). When the bike is put on a Battery Tender, the...

You have a voltage drain on your bike while the key is off that is why the tender wont full charge the battery. If you have any electrical accessories such as an alarm try disconnecting them they may be draining your battery while sitting. If no accessories then you have a short somewhere in the harness causing the drain.

Nov 02, 2010 | 2008 Yamaha YZF-R6

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Bike will not start or stay running on a full charge battery/bought brand new battery, still same promblem,jump bike off,will crank ,ride bike for 30 min. park bike, leave bike running,lights start's to...

sounds like the problem is your battery is not charging when you are riding. The most common cause is a faulty regulator / rectifier. Contact a motorcycle wreckers for these parts, or your yamaha dealer.
Easy way to test is, when your bike is running, and the lights start to dim, before the bike shuts down, using a volt meter, test the voltage at the battery terminals, should be about 14V. If faulty rectifier,no charge going in to your battery, then the reading will be low, about only a few volts. If you dont have a volt meter, then any mechanic shop can do this test for you. best to have this done before buying any parts.

Aug 11, 2010 | 2000 Yamaha YZF-R1

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Bike wont start but my multimeter reads 11.24vdc when i go to start it it loses all power all lights go out and nothing no sound no nothing it will start if i jump it ride it cut it off it wont start again

From the description of the problem it seems that the battery has gone. It is not the voltage only, it is the amperage/current as well. You can get 12 volts by connecting eight flashlight batteries too. But since the amperage is missing you can not light up more than a bulb or run a radio or whatever. Similarly, your bike battery is showing the voltage but when you press the self starter button it is no go because the self needs very high current which the battery cannot provide. And when you jump start it, it gets full current and the bike starts and runs. When you stop and cut off the current is missing. So, my suggestion is to replace the battery.

May 30, 2010 | 2000 Suzuki GSX-R 600

1 Answer

Jump start bike, at full throttle volt meter reads 12 at idle not charging

The lower the voltage the higher the amperage. At twlve volts the charging sytem should be pooring the coals to the battery. Bttery sounds more like the culprit. If battery charges up corectly, the voltage will slowly rise to 14,.2 after startup. Have battery charged and load testest out of vehicle (bike) As battery goes bad the charging system works harder and speeds up battery quietus( death)

May 10, 2009 | 1981 Honda GL 1100 Innerstate Gold Wing

1 Answer

2006 Yamaha YZF-R6 will not start

try cleaning the battery terminals, check the battery voltage when you hit the starter, If you run it too long and it isnt charging a good battery you can damage the regulator again, same if you jump it off a car battery, it can cause damage

Mar 16, 2009 | 2002 Yamaha YZF-R6

1 Answer

Want hold a charge

get a test light and a schematic. unplug stator plug.start bike ,make sure battery has full charge. test each pin on connector that is attatched to the 3 yellow wires.should light on each pin. if all good check for burn marks around connectors, front & back sides, and on wires. if no power on yellow wires, stator problem. if power, plug connector together, now test for voltage in wires on the voltage regulator side of the connector, to see if the voltage is making it through the connector.if there is power to volt. regulator,test w/ multi meter across battery leads to see if there is charging voltage to battery,approximately 13-15 volts. if only battery voltage(12.2 or less) while bike is running,voltage regulator is no good.if charging good, but bike wont start after prolonged sitting(say overnight) a system amp draw test is needed to see if something is staying powered up while bike is not running, drawing down battery.

Feb 18, 2009 | 1994 Suzuki RF 900 R

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