My mower makes an awful squealing noise when it is running.

My mower makes an awful squealing noise when it is running.
If the noise you hear sounds like you ran over a cat, then you most likely have a worn out starter clutch. The worn clutch will bind up and cause the clutch to rub the crankshaft. This rubbing will create a high pitched squealing noise and may also damage the recoil and pull cord.

The only real remedy for a worn starter clutch is to replace it with a new one. We often see customers take the starter clutch apart and attempt to quiet the squeal by filling it full of grease, but this only makes the problem worse and will lead to more damage. If you suspect your starter clutch is worn out, have it replaced as soon as possible to prevent further damage to your engine.