I have just bought a Koala 24 as a restoration project . Unfortunately it was neglected and sunk on its mooring ( rain water blocked drain holes ) and was under water for about a week .. So quite a bit of work required.. Have jet blasted the hull and it's coming up OK. It has a Yanmar Diesel engine . anyone know the model ? I will also be looking for a main sail, it has a jib and two spinnakers .

the trailer alone would be worth twice what I paid

Probably this one.

www.yanmar.com/marine/product/engines/1gm10/

Pull the injectors and see if you can crank it over by hand.

Photo of the engine would help us identify it.

gary