Where can I buy a used motorcycle in bali?

I’ve just moved to bali, have 5 year residency (kitas), i’ve always just rented when coming here but now that I live here i’m looking to buy a used motorcycle.

Looking for a scooter and a bike and have some questions regarding this. Where can I look at options? Are there used motorcycle dealerships? How does the registration process work here? Are there any websites where people list their used bikes?

I’ve looked at fb marketplace and am aware of the factory dealers but there aren’t many options. Any info or advice about this topic would be much appreciated, thanks!