I have the inline carbs, one has WM 5-1 stamped on it and the other has WM 5-3 stamped on it. Does this help? I still cannot find a rebuild kit. I searched here on iboats and WM 5 is not an option, i'm lost.
I have serial # 4540527 and I was thinking that same thing. I assumed it was a typo in the system. Now I just need to find a link to a manual that works.