how old is the engine? It is most likely made for the 50/1 ratio.
The mix was 24/1 before the early 70's then went to 50/1 that equates to 1 pint to 6 gal of gas.
Once the VRO engines came out they mixed their own ratio that ranged from 50/1 at WOT to around 100/1 at idle. Just pour it into a tank and the fuel pump did the rest.
With 2 stroke outboards I would rather have the mix heavier than lighter.
New plugs are cheap.......pistons and engine rebuilds not so much.