Why isnt my 1989 honda vtr 250 getting a spark?

I just bought a 1989 honda vtr 250 it has a strong crank like it wants to start but won't start. The battery was bad so I had to use a bigger battery from my dad's motorcycle and it would crank stron but still nothing. We took out the spark plug and put it in the wire and held it near frame and no spark at all while cranking, could it be a bad ignition coil,rectifier, or stator or what?

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