Normal to be able to spin valve springs by hand ?

I take a light hammer and tap the valve stem (rockers off) enough to just open the valve and you can hear the tone the springs make. They should all sound about the same. Hit it too hard and the keepers might come off.

Electronic ignition? Those can be fussy about low voltage. Factory FZR600 wouldn't rev past 4-5k, replaced battery and 10k no problem.