Hopefully someone can clear this up!

Im a bit confused about the power output of my MC16.

In the model history page it says:
"the motor once delimited was quite capable of making 55hp".

However, in the tuning section, its stated that the Japanese speed restriction law didn't come in until 1989.
As the MC16 was produced in 1987, why is it restricted?

Also, is there an easy way I can check if mines is de-restricted or not (apart from seeing how fast it goes!) and if its not, what does it involve?