Why don't you want to go to a garage Bilbo?
I hope you aren't thinking of breaking the law and invalidating your insurance !!
Believe me, it's not worth it because you will only get another 10mph but you could get 6 points on your licence or even a ban!
I would look at the laws for changing a scooter into a motorcycle which in practice you will be doing!
I could do it for you in 20 mins but I wont!!
C3..................
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