Hello, I have just gotten my hands on a 31cc ryobi and it looks to be in great condition. However, there is no pull starter! It is for a 48 inch boat and there is a clutch in the end. How do I get it started??? I was thinking more in terms of electric start but I am open to any ideas because I cannot seem to find my own solution. Please help!

without the plastic casing your options are limited.
We use the longshaft engines like yours on our rc airboats, with some tubing for a spacer you can install the rope wheel on the shaft for starting(aka Geezer wheel style)
In this pic the prop is where your clutch would be.