I'm looking for a new dinghy engine to replace my formerly faithful 15
hp Merc 2 stroke.

I'd prefer another 2 stroke for weight reasons but it's not an
absolute requirement.

What I'd like is a 20 hp short shaft, with electric start and tiller
steered.

Any recommendations? The primary considerations, other than the
above, are longevity and reliability. The engine is going to be used
in salt water and receive minimal maintenance.