I have two CCs. One is a new LTX 1054 with a bagger.
The other is an SRC 621 self-propelled that I just picked up (along with a Jacobsen 321 4-blade) for $20.00 for the pair. (i.e. $10.00 ea.) Both were "non-running".
I put in a new plug, and the CC started. It didn't run real well until I cleaned up the linkages to the carb, then it ran fine.
Didn't shift all that well, and the clutch was a bit flaky. I replaced all of the cables, and it now runs like new. I figure with the original cost, plus the cables, ad plug, that I have a total of $75.00 in it. Pics below.
Cub Cadet SRC 621 Lawn Mower. The original owner gave up on her just because she smoked. All that was wrong was a bad head gasket. See what happens when you use cheap fuel on a high compression engine? Easy fix. Runs like a dream now. Great Kawasaki engine. I also cleaned up the self propel system and all 6 speeds work fine. It's the one on the left!