I did some checking and if you should actually
need a coil one of these should work. They are
available with a single or twin sparkplug lead.
You can use the coil with 2 leads by grounding
the one you don’t use to the magneto plate.
Search eBay for “Coil P/N MFR-61689” for the
2 lead coil & “Coils P/N: 9786E128” for the
single lead coil.
Tubs.
A "Boathouse Repair" is one thats done without having tools or the skills to do it properly.