Q1_Aircraft: Q1 Engine Option

What are your opinions about this as a possible engine for a Q1?

www.commercialpower.com/display/router.asp?DocID=80135#anc

23hp V-Twin and 77lbs dry weight. Could weigh less if you removed the
shrouding/starter/ etc....

What was the weight of the original Onan engine?
What was the original prop diameter/pitch?

Thanks!
Jon