First of all, thanks to many on this forum. I have been reading up here for a few years, and I am continually amazed at the knowledge and willingness to help of so many members. I have a 1995 Toro 724 that I picked up a few years ago. I replaced all the fuel lines, cleaned and rebuilt the carb, painted the auger and housing, and replaced the auger and impeller bearings. Runs great. I don't need another machine, but I saw a used 521 (1988 I think) nearby this week and got it for $20. The owner could not get it to start, but it looked pretty clean, and had decent compression. I was able to get it running pretty easy (fresh gas, clean plug, etc), but it didn't run that well. So I will do a more thorough fuel system cleaning and fixing. I have the carb off (waiting for a gasket), and the starter and fuel tank off. I will replace all fuel lines and install a shutoff. Couple of questions for the team here. The PO installed an aftermarket non-adjustable carb. I assume there really is no adjustment, right? I have cleaned the fuel jet/bolt (??) including the small opening. Also, as seen in the pics, should I put a bit of oil on the engine pulley and the flywheel? They both have some rust, from sitting I assume. Thanks again for all the insights, info and references.