I know that you have a stihl engine, but this old Kohler manual, section 8 does an excellent job explaining how the ignition system works. If you do...
The toro self propel is really a one wheel drive system friction moves the other wheel I bet turning one way is easier than the other. Where did you...
The best way to find a replacement engine (Magnum is no longer available) is to contact a dealer who sells the brand of engine you would like to use....
I highly doubt that you have a bent crankshaft on a 20333, unless you hit something so hand that this mower flew out of your hands. More than likely...
Service and repair them..because I just love old engine's
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It takes less time to do the thing right than to explain why you did it wrong.
........... Retired Agricultural Mechanic/But now I am just tired...! .............