I will be in Lombok in December 2016. During my trip I would like to visit other islands with a scooter (Bali, Nusa Penida, Nusa Lembogan, etc.)
I know that there is ferry but that is too slow (approx. 4 hours). So I would like to find a faster way to travel. What are my options?
As proposed by @Roddy:
I'm sure you could pay a small fortune and fly the scooter between islands. Otherwise there are fastboats between the islands -- approach any of the hundred odd operators and ask them how much extra to take your scooter with you.
So the solution is to go to the closet harbor and try your luck.