My experience with police here is that they are incredibly bored.
They will bother you about the most minor infraction and take it to the full extent if it gives them something to do for an hour.
Of course that's because nothing bad ever seems to happen which they have the power to do anything about. Crime is everywhere but it's far too red-taped for them.
I just found out that there are special police teams for bike gangs, but the normal police don't interfere.
The special teams have intense bikes and themselves are bike-fanatics that tweak their own bikes.
My girlfriend's bro got arrested by that team cuz he was racing on a mountain in Nara. All he could saw was "oh my god they were so intense, I tried to run but they are pro!"
So I correct myself, Ghost Rider might meet his match.
edit: apparently her bro also had some illegal bike hardware on his bike but the cop sympathized with him and ignored it lol
edit2: I found a youtube video of them; the black panthers hahaha