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Hi William:
This is fun because it's already broken so you can't easily make it worse.
I'd start by making a clear spot on the workbench and then start taking it apart. Label the parts, keep them organized, and maybe even take a few pictures as you progress.
Think of it as fun. Every bit you remove has a purpose, so try to check the functions as you go. When something doesn't do what you think it should, you've probably found the problem.
Just take the cover bolts for the pull cord off. Then see if it works. There are usually two cogs that engage into the shaft of the engine. These cogs push outward when you pull the cord, engaging the shaft of the engine.
You probably need to replace the starter recoil. This is not a very expensive fix. Just be aware that this problem is usually caused by having to pull the starter rope excessively because of some other starting problem. Once you replace the recoil, keep your engine running properly.
Determine whether or not the engine is locked up by removing the plastic outer shell including the pull cable. The cable reel once dis-engaged from the crankshaft should freely pull out and retract on its own. If the cable reel is still hard to pull, you can replace the reel. Otherwise the engine is binding probably cheaper to replace the whole unit than attempting repair.
remove the sparkplug and try to turn the flywheel if it turns freely then the engine is most likely ok. if it does not turn you have a locked engine that means its toast. If it does turn then you have to look closely at th pull recoil that it is engaging the flywheel.
Pull cords are all pretty similar so if you've seen one then etc..... Does the cord retract? If it's a broken spring then the pull cord would not retract. If it is retracting then it's probably dirt, grass clipping interfering with the spring loaded locking lever. Either way the only way to be sure is to remove the top cover and inspect it visually and clean it out and spray some lubrication on it. You should be able to do this without taking apart the actual cord and retracting coil spring. It should come off as a unit.
Once you have inspected it if you you have any other questions please let me know. Hope this helps.
Remove the starter mechanism from the saw and try to turn the flywheel--it should turn freely except when the piston is rising against compression. If ok, pull the starter cord and watch for twisted cord or a damaged/split spool. Try to turn the spool CW by hand to see if it is bound up by something. Was the starter cord just replaced? If so, maybe the return spring was over-wound and can't be turned further. Hope this helps!
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