Re: S45 slow speed needle

[Tubs]

Unless you can reshaped the seat as well
you’ll likely only be making things worse.
The shape of the needle mirrors the shape
of the seat. Changing one and not the other
can make adjustments so sensitive that you
can never get to a proper setting. If the
carburetor is not functioning as it should now
the solution is to replace it.

A "Boathouse Repair" is one thats done without having tools or the skills to do it properly.