Question about 1999 kawasaki ZX-6R Ninja

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When driving the bike with the lights on it drains the battery and when i go to start the bike again it wont start. I have recently put in a new battery and started putting it on a optimiser when i park it in my garage

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Wayne Thomas

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Have the charging system checked. Most likely you've got a bad stator (the generator), or a bad rectifier/regulator. Your bike's charging system should put out at least 6 amps of DC current, measured at the battery, at roughly 4,000 RPM.
You can also do a quick and dirty check with a regular volt meter by reading the battery voltage with the engine running. Hold the RPM's briefly at about 3,000 and the battery voltage should rise to around 14.5 volts. If not, then the charging system isn't functioning properly.
Keep in mind, too, that letting the engine idle for extended periods of time will kill the battery (even a properly functioning charging system does not put out much current at an idle).

Posted on Nov 02, 2009


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