warwickl said..
Currently I have a 5hp 2 stroke about 6 years old.
All it is used for is about 100m shore to mored boat for 2 people so about 160kg with gear.
I would like a lighter 4 stroke and the Honda 2.3 was suggested.
Rubber ducky is a Hyfield 2.7m in very good condition.
What do people think and recommend if buying new?

Check the weights, is the fourstroke really any or much lighter than the two stroke?

I had a Honda 2.3hp for about three months then offloaded it on Gumtree and found a nice Yamaha 5hp, 2 stroke and it was a great trade up.
Some people love the Honda, but I found it noisy, slow, and even when left on the correct side for transport, got oil in the cylinder.

I have also got an old Yamaha 2hp two stroke in the shed, the old always in gear, slide throttle one. Bullet proof and it would be lighter than a Honda. A great tender motor, doesn't get flushed and it thrives on abuse.
I personally think a low hour Yamaha two stroke is the way to go.