go to this link http://boston.craigslist.org/gbs/pts/310874690.html I have this huge engine sitting in my kitchen. A fellow who claims he knows a lot about engine, kept telling me that it is a Wisconsin engine but the tag on it says Briggs and Stratton Model 23b. The engine is a nine horse power. It is a side shaft engine with a pulley that supports a wide belt. This pulley is original to the engine but is easily removable. The engine starts right up and runs fine and is in original condition. Someone once offer me $250 for it but I am not sure of the correct value. I am looking to sell it. 617 642 9590 for more info.