I can tell you more now, besser. The engine is 25 cubic inches, second design generation, with vertical crankshaft, Flo-Jet carburetor, plain main bearings, and a 12 Volt gear-drive electric starter with alternator. Here is the Illustrated Parts List:
http://bsintek.basco.com/BriggsDocumentDisplay/Z6lttJVJ1DajI.pdf

Here is the Operator's Manual:
http://bsintek.basco.com/BriggsDocumentDisplay/msoBGL-K_ny7tH217FzoPu.pdf

The IPL will tell you many things, including that it has a reciprocationg Synchro-Balance system in the crankcase to reduce vibration, and its carburetor is a Large One-Piece Flo-Jet. Bear in mind that the Synchro-Balance system relies on the engine always being filled to the correct level with clean engine oil. The results if you fail in this will be dire.

Access to the Parts and Manuals sections is by subscription only. There are separate subscriptions for various sections.

Last edited by grumpy; 05/10/14 07:21 PM. Reason: Add detail