Dingy Outboard Motor
The 4 stroke runs on the gasoline you get from the gas station (or fuel dock)...the 2 stroke takes a 50:1 oil/gas blend. So - you need to mix at the fuel dock when you''re filling your fuel can. Not really a problem since the sell mixing cups to get the proportions right.
Regarding the HP...do the boat specs (either in an owners manual or on line) tell you what size engine the dinghy is rated for?