You can try your local lawn mower sales and service store. Also, there are auto parts stores that carry lawn mower supplies. Noy sure if you can buy just a key or if you will need to buy a different switch altogether.
One of the most common reasons for a lawn mower not to start is that it is out of gas. Another reason is that the "key" has been broken. This key is designed to break if the mower hits a hard object.
There could be many reasons why your Sears riding lawn mower won' shut off. The key could be jammed for example.
Is this even a real question? Seriously, man. What does your mower run on? Hopes and dreams?
You can use 10W-30 or just 30.
sheared flywheel key. youtube has vids... type in mower cord backfires & you'll see instructions on how to fix it.
hurt no, if you pulled your cord and it jerked your arm and hurt you have a shear fly wheel key.
If it is a riding mower it may have a blown fuse. They are usually located near the solenoid.
check the flywheel key. it sounds like it has sheared and will need to be replaced
Your flywheel key might be sheared
A sheared flywheel key (advanced timing) will often cause a red hot muffler. This happens when the mower blade hits a stump, rock, etc.
You probably forgot to put the shear rivets, bolt, key back in depending on the make and model of your lawn mower or you have stripped the bolt.