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Well, today I was browsing around the 'net at what was for sale locally and found a 'non-running' model 680553 for $25.00. I was lucky, I was able to sneak it home just as the wife was driving down the road in the opposite direction! She was just telling me last week that I was to buy no more mowers!! LOL 
Anyway, I can't read the first digit of the decal on top of the recoil but I think it's S19ZPN, but at the Lawnboy site I had to enter it as 680553 to find the info as the S19 models search ends at 1991, but by the serial number mine is a 1992.
When I got it home I pulled the plug and it was fouled up pretty bad. I drained the fuel and put new fuel in the tank, installed a CJ14 plug, took the Walbro carb apart, cleaned it and checked all the settings, sharpened the blade, and took off the muffler and cleaned the carbon out. Once I had everything back together I pulled the cord and it fired right up and runs very niiiiiice! I was just going to buy it for spare parts for my C21CPN, but it runs so nice I may just switch engines with my C21CPN and keep the 680523 as a spare. It just doesn't sound as nice as the engine on the C21, maybe different size decks have different exhaust tones? That solves my other problem from the MTF forum where I was working on a 19" mower with a D600 engine; well now I have one with an F engine!
Anyway, I can't read the first digit of the decal on top of the recoil but I think it's S19ZPN, but at the Lawnboy site I had to enter it as 680553 to find the info as the S19 models search ends at 1991, but by the serial number mine is a 1992.
When I got it home I pulled the plug and it was fouled up pretty bad. I drained the fuel and put new fuel in the tank, installed a CJ14 plug, took the Walbro carb apart, cleaned it and checked all the settings, sharpened the blade, and took off the muffler and cleaned the carbon out. Once I had everything back together I pulled the cord and it fired right up and runs very niiiiiice! I was just going to buy it for spare parts for my C21CPN, but it runs so nice I may just switch engines with my C21CPN and keep the 680523 as a spare. It just doesn't sound as nice as the engine on the C21, maybe different size decks have different exhaust tones? That solves my other problem from the MTF forum where I was working on a 19" mower with a D600 engine; well now I have one with an F engine!
