Question about 2005 BMW R 1200 C Montauk

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Havy A friend of mine has a bmw r 1200 . When she starts it, it cranks once or twice as if it doesn't have enough juice. If she opens the choke, it'll start right away. I checked the battery and the generator which are both fine. The battery is holding at 13 volts, which is above the manual's requirement of 12.8 volts and the generator is putting out at 13.9 volts (the manual indicates 14 volts as good). The next step is to check the stator coil resistance then if all is good, it suggests replacing the rectifier. But I'd hate for her to have to purchase a new rectifier only to discover it's still doing it, though, we may not have a choice. Anyone ever experience this and/or have any suggestions what to check for?

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Hi i would remove the battery and take it to your local dealer where thay should have a battery test unit this will highlight or eliminate any battery problems before an expensive replacement

Posted on Dec 29, 2008

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If it was mine, I'd replace the battery. It could have a shorted cell which would cause it to show good voltage but low output. Only way to know is to replace it.

Posted on Nov 20, 2008

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