Banyuwangi to Kawa Ijen by motorbike, possible?

I would like to avoid the packaged tours, and go to Kawa Ijen (Sempol) from Banyuwangi by motorbike (scooter).
This looks not only cheaper but also nicer and more fun.
My only concern is the state of the road. Not sure if this is doable during day time, even less during night time. Note that it's dark around 17:30 in Indonesia.
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Naik HARLEY ke KAWAH IJEN ( BONDOWOSO - BANYUWANGI )
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