Small Engines (Lawn Mowers, etc.): mower will not start, impact gun, strap wrench

Question
I have a Craftman mower that I hit a piece of pipe and the motor stopped. The mower has spark and compression. The blade seems to turn to turn by hand without and trouble or noise, however I can pull and pull and not even get a pop like it whats to start except a few times and the pull cord snapped back like a kick back. Is it possible that it kick out of time and if so How can I reset it

Thanks in advance
Tim  

Answer
You will have to replace the flywheel key; this is very common when the blade hits a solid object.

The blower shroud, the top metal cover on the engine, needs to be remove first.  This will expose the flywheel.  You will need a strap wrench and ratchet/socket to remove the flywheel nut; an impact gun works better.  Once the flywheel nut is removed, you will need a puller to remove the flywheel.  Once the flywheel is off you can replace the key.

I would also check for a bent blade and the blade adapter.  The blade adapter also has a key of some type, usually steel.  Normally they will not shear, but I would still check.

NOTE:  When installing the flywheel, have a buddy or use a string to hold the engine shut-off lever.  Engaging the lever pulles the flywheel brake back to allow the flywheel to be installed.

Let me know if you have any other questions.
Eric