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I went to start my 07 RSV this morning, all dressed and ready to ride. Starter sputtered, making sounds like dying battery. End of ride. Bike has 33k on it. So here're the symptoms that I've measured so far: Battery open circuit voltage is 12.3 after trying unsuccessfully to start the motor. I put it on my charger, and got a green light after five minutes. Open circuit v now 12.8. I put the battery back into the bike and it cranked normally. I measured the v across the battery with motor running. At idle I get 13.7. At very high engine speed (no tach) I get 13.9. It never gets above 14v, and only varies between those two points, 13.7 to 13.9 at any engine speed. Book says should get above 14v charging, up to 14.5. Does this below-14v output, and the fact that it varies only .2v, point to a stator or regulator problem? Interestingly, I had a year-old battery fail, and also spit battery acid out into the battery box, some of which then dripped down onto my swingarm. It was a Westco. I suspected an overcharging situation then, but if anything, my charging output is lower than it should be. The new Yuasa that replaced it four months ago has worked flawlessly until this morning. I suppose the new Yuasa could be defective, but how odd to have two battery failures within four months? One suggesting overcharge, the other undercharge? Erratic Regulator? I'm checking connections now. Thanks for all help.
