I have a 1992 Honda 300 Fourtrax 2X4 that does not appear to be generating enough electricity. With a freshly charged battery it initially works fine but after extended use it will start to miss and eventaully quit running altogether. At that point it won't even turn over. It's done until the battery is charged. If only used for short durations, it starts and runs good for as much as a few weeks. If you put the charger back on it, it will go for another few weeks. Obviously, this is taking its toll on the battery. Where do I start? Thanks.