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.