Most likely the one way brg (OWB) just needs a good cleaning as well as the shaft it runs on. Use motor spray or something like that and after cleaning, grease the shaft with a very thin coating of grease. They make a special OWB grease, but not sure its called for.

Make sure to note the direction the OWB comes off - it spins in one direction and grabs in the other. If you install it backwards it will just spin. Nitro residue can work its way out into the OWB and this is usually what cause this prob. Some motors are worse than others about it - you can just motor spray it down to clean it and that usually gets it back to working. You'll prob need to start maintaining it now too.