I attempted it by hand and it wouldn't budge. Looked on a ninja 1000 forum and people said it seemed like a 500lb gorilla had tightened the oil filter on there. I'm guessing for the first oil change, by hand is not going to happen. For later oil changes I'll have the filters with the nut for ease of use.
I'm going to guess that the ninja 300 has the same type of oil filter on it and if its torqued on at the same rate that the 1000s are then its not going to be possible to do by hand. So, for the noobs, get an oil filter wrench if you don't have one
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If the Ninja 250 doesn't have enough power for you, then you don't know how to ride it.
AFM #676
Supersports are for n00bs