EFM 450 or 350
It does not have to be a Dayton replacement; in fact, if you get one from EFM it will likely be an AO Smith. I am running a Marathon motor on mine, perfect fit and smooth operation. Item # 4782 direct from Marathon.http://www.marathon-motors.com/1725-Rpm ... t_c378.htm
You can use quite a few different motors on these stokers, but I like the one listed above the best. They are QUIET and maintenance free. Nearly anything that bolts up and is enclosed (or has a dust cover) will work, but the 1/8hp units are the most quiet at startup and usually the least expensive.
If you have a local EFM dealer, give them a call and ask for a price on a new motor and the cost to swap your fan over. Sometimes those fans are miserable to get off, and if you bend or ruin the fan...you just doubled the cost of the repair.
One more thing, I'd change that gearlube if the stoker got "wet".