Hi all, Last fall I bought a used 2012 Yamaha Raptor 90 for the kids. It needed the carb cleaned of old gas but got it running pretty good, but I have been having trouble keeping the battery charged on the thing. I thought at first it just needed a new battery and got a new one but still having troubles. Is it the voltage regulator that charges the battery when riding? Obviously there isn't an alternator like a car. Looking to get this running more reliably for them. Thanks.