I’m working on a Elgine which is actually a 1961 Mcculloch/ Scott 14.1 hp. Tying to source some impellers. I’ve found a rebuild it for the Carter N type carb but several carbs were used in those years. I believe the gearcase on the 25 is the same at the 14.1 or designed the same, Bai-o-matic. Mine takes 2 impellers.
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Thomas you have the original McCulloch part number and the Sierra equivalent from my reply to you in your other thread. You can set up a search for those in ebay and get an e-mail if/when someone posts one for sale. They’re apt to be very old stock…..but better than nothing.
There are a couple of members here who make impellers if you can supply them with the original core. Those guys seem to shy away from Bail-O-Matic impellers though because (so they say) of the high failure rate in those motors. All you can do is ask and see what they say.
How about that HONDA equivalent? Does it seem to match the impeller in your motor?