Mercury Kiekhaefer Outboard 21713 Connector Assembly Bar Mark MK Cable Extension Transom Plate and probably a good idea

and probably a good idea to just replace it while you are down there

The correct thermostat for this is either 3853799 or Sierra 18-3558 which are around $15

3744043 / 03744043 Crankshaft Pulley

Found on boats with OMC Stringer power plants using the standard OMC stringer steering cable

Item Details & Compatibility Removed from a 1963 Mercury Outboard 50hp 500E 4cyl (Serial Number: 1553XX8 - I can't read some of the numbers)

Mercury Kiekhaefer Outboard 21713 Connector Assembly Bar Mark MK Cable Extension Transom Plate and probably a good ideaItem Description Mercury Part Number 21713 Which is some sort of Connector assembly. All the little parts somehow go inside of it. I was unsure of what this item was for quite some time, but since I have learned from another customer that this item was used more or less to extend the cables. I think the content of their message describes it the best: "It was used for larger boats. Mercury made a standard cable. If the boat was larger then the standard