Thanks for the replies guys and my mistake not saying this is a 2-stroke motor. Most of us older guys are familiar with the two clyinder version 50hp but this one looks like a 60hp and 70hp version. Here’s a link to it: http://desmoines.craigslist.org/boa/4480573704.html
And yes while the displacement maybe the same of some motors it is more than jets. That why I put de-tuned in quotes, to account for the urban legend factor.