Chances are the coil spring has a broken "locking tang" on the end. They are notorius for breaking when you pull the cord to start the mower. You can go to Sears and purchase the OEM replacememt fairly inexpensivly. The new spring is stronger and contains the instructions on how to install it.
the recoil spring is broken.
It's a long piece of metal that's about 1/2 an inch thick and it's what pulls the pull cord back into the lawnmower after you pull it out.
You have to buy a new rope, remove the cover from the engine that contains the manual rope starter. There is a spring inside that can fly out and injure you if you do not know what you are doing. My suggestion is that you take the mower or the cover to a lawn mower shop and let them replace the rope if you are not comfortable tackling this yourself. It can be tricky to install the new rope and wind the spring just right.
The cord is tangled inside. Take the recoil off and then you can untangle it from the inside. Sometimes to pulley will split at the seam.
If the cord hangs loose/does not rewind you have a broken rewind spring. Not difficult to replace.
I take it that you have completely renewed the cord, if so, you now have the the cord/rewind spring housing in your hand. Depending on the manufacturer you need to re-tension the spring and rewind the cord at the same time. Good luck, it' fiddley and requires dexterity AND patience.
In general- secure a replacement starter cord. Remove the cord starter reel, Wind the spring driven reel about 5 turns, aligning the cord hole in the reel with the channel for the cord. While holding the reel against the spring, insert the starter cord, tie a knot on the cord inside the reel, let the spring gradually turn the reel until the cord Is wrapped on the reel, replace the starter wheel unit on the weed eater, replace the screws that hold it in place.
take it off, youtube has instructional videos for this. hard to tell you exactly what bolts to remove.
I don't think that is caused by the flywheel. I think it's your recoil. They have a coiled spring inside and it sounds like that spring has detached or broke. Be VERY careful if you try to remove that, it will spring out and go all over the place. They are pretty tricky to replace. It's best to replace the whole recoil. It is possible to just replace the spring, but takes alot of experience. It could also be the dog house not engaging. That is easily replaceable, just make sure you don't knock the spring out while you're doing it tho. Be sure to hold the spring down while removing the bolt that holds the dog house down. When you pull the cord you should see a thing pop out. That's the dog house and that's what engages the flywheel.
The answer should be shown on the electrical appliance itself, often near where the cord enters, or near the main switch. If not, you can find it in the owner's manual. Different mowers have differently sized motors and other features that will determine the minimum amperage necessary.Note that the longer cord you use, the larger the wires must be, as otherwise it will lose voltage due to the resistance and your lawnmower could be damaged by operating at the lower voltage.
I think its the brain using the spinal cord
motor neurons