1974 Honda 750k4 Won t Start?!

I just purchased a 74 honda cb750k4 from a private seller. Rode it home and everything seemed fine. I drained and changed the oil the next morning alongside the filter. The day after that I try and start the bike but it wouldn t start. It started leaking a bit from the oil filter (I tried to tighten but it kept leaking slightly). The engine turns but the bike wouldn t start.

The gas tank seemed to be almost half full? Could it be that there isn t sufficient gas? Or is it an electrical issue? Please help!

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