Rob, two points. First, when I approach a strange 4 stroke engine, before even trying to start it, I check the oil level - in case there isn't any, and in case there's too much. If there's too much, and it is a gravity-feed fuel system, I become highly suspicious that someone has left the fuel tap turned on, and filled the sump with fuel. Petrol makes a lousy lubricant, and as soon as you disturb or warm a petrol-oil mixture it gives off petrol fumes that are very dangerous around a running engine.
Second, here is what seems to be the illustrated parts list for your transaxle:
http://www.odref.com/peerless/206-SERIES/206-206-504.PDFThe two gears that seem to have been trashed are items 6A and 15. At a minimum, I suggest you verify that your 6A used to have 15 teeth and your 15 used to have 43, before you pursue them using the part numbers supplied at that site. You should also check that as many other details of that transaxle as possible, match yours. The identification numbers seem to match yours, but I don't think those gears are going to be cheap, and they may not be returnable when you get them.
There is a tech manual that covers your transaxle (the MST200 series, MST standing for Manual Shift Transaxle) as well as a host of other Tecumseh and Peerless transmissions and transaxles. The manual used to be included in the ride-on manuals section, and I hope it will be again soon. I do not know of any plans to include the illustrated parts list at this time.
