Leimbach pump motor options?

[Blender]

i ran a holmes hobbies crawlmaster sport outrunner on my leimbach pump. it was completely bolt on. It was a little fast with a 950kv rating, but that's easy to dial down with a simple airplane speed controller.

I've since swapped to a tiny outrunner it's only half an inch long and spins a little slower than the crawlmaster. So far no problems, but the machine hasn't seen much use. I'll snap a picture when i can. It's comically small.