Mike Rapoport wrote:
The KX155 in my "new" airplane (Helio Courier) seems to have bitten the
dust. It looks like an old POS and I am trying to figure out what to do.
What are the functional differences between the KX155, KX165 and the KX155A
and KX165A?

There's a list of the differences between KX155 and KX155A at
http://www.seaerospace.com/king/kx155a.htm
Look for the items in the list with an asterisk.

Dave