Four stroke, only as I know little about 2 stroke engines.
I managed to speak to one of the Pirahna owners yesterday. He mentioned that it’s light-ish, reliable and economical on fuel. He claimed that it’s as reliable as a Yamaha and pointed out a service centre over in Suffolk that he knows. Also it comes with a 5 year warranty.
He also mentioned a write up by Simon Everett which I found here
https://www.saltwaterboatangling.co....-killer-whale/
Nothing much that I didn’t know already but the write up gives a bit more information re it’s performance on a 3.70.