I bought this dirt bike from a farmer in as found condition. It has no battery or tray for one but has a spot for one. Should it have one or are they only for electric start? I have never started this bike but plan to work on it tomorrow. He said it was running a year or so ago and it seems to have compression and is not locked up. Any good websites out there that Im not finding? Are these rare and valualbe or not at all? Anything helps. Thanks