Re: What type of flusher do I use???
Aside from the gearbox and cowling, the 25B is very similar to the later model 25C2 & 25C3 motors, so parts interchange may not be a big problem.
I haven't looked at a 25B midsection in along time, but I would expect there to be a removable water plug on the shift lever side of the motor. Tohatsu makes a flushing attachment that scews into this hole, see page 36 of the 25C3 owners manual http://www.tohatsu.com/tech_info/manuals.html