check out their web site. ywengines.com
I have both the YW-24, and the YW-48.
The 24 is in a Rascal 110 and it hauls it around very well.
The Yw-48 is in a GP Patty Wagstaff and has unlimited vertical, plus very little vibration They do cost a few bucks more, but the quality is excellent.
AL