Not sure but it looks to be a CY/RCMK 26cc (F-263 on the pull start) 5.5 HP motor , the guy I bought it from said it was a 29cc motor but I don't think he really knew . It's a new motor not broken in and it still went 44 mph with an of the shelf Prather 275 prop. Think a single 8-9 HP motor would be perfect for a boat this size or an inline setup let me know what you think to get it in the 60mph zone...