Look at the area around the starter on the engine. If there are screws that hold the starter onto the shroud you can unscrew them and remove the starter from the housing and work it immediately. If there are rivets, you will need to remove the entire engine shroud from the engine and drill out the rivets to remove the starter. If you have to remove the shroud you shouldn't have to actually remove the starter from the shroud unless there is damage to the starter itself. By that, I mean to say that if the problem is simply a broken pull cord, you only need to remove the shroud and leave the starter attached to it.
Winding the new cord is simple enough. Grab the center of the starter and spin it to put tension on it. You want to turn that until it gets pretty hard to turn, but do not force it. Once you have it tensioned up, put a screwdriver thru the fins to keep it from unwinding as you will need to hands. Once you have it blocked feed the new rope in from the outside and through the hole in the starter rope pulley and tie it off securely. Then hold the string and remove the screwdriver. Allow the starter to slowly wind the cord up onto itself. When it stops pulling the rope in or when you run out of rope, pull about 6 inches out and then clip the rope and tie the handle in place. Then put the starter back on the shroud or the shroud back onto the engine (depending on which you did).
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