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How old is your battery? Has it been overcharged? The battery voltage at rest should read 12.8Volts when fully charged. If, when it is charging from the engine, the voltage exceeds 14.8Volts, suspect an overcharge as that will damage the battery and reduce its output power. I can't see there are any shorting problems as you would notice the hot wire smell. I remember my old Honda 4 had a battery overcharging problem, many years ago, causing the side lamps to flatten the battery within half an hour. There was no regulator fitted to that old model, all it had was a large Zener Diode to stop the voltage going too high and mine was open circuit, boiling the battery! Hope that helps.
Im not sure about "bolt straight on" but it should be very close. most times bike models run for years without much major change. You may have to change a few brackets, or do a bit of bending and filing to get it to fit. The 06 ZZR has the twin headlights. I looked at some pictures carefully of the two different models. The frame is the same for both, so there is a good chance it will bolt straight on.
find the coils and check the terminals with a tester to see if power is getting to them. if it is then it could be the coils or ht leads/ caps
if no power at coil then problem is between battery and coil or in the kill switch. check all ground / earth terminals you can find also
good luck, ride safe