I installed the air filter and started it up. This time it squealed for a few minutes on high and low revs, I noticed the pull cord unwinding almost to the ground and then slowly going back into place. It stopped squealing after I stopped and re-started it.

Upon deciding to tackle the sprag clutch I continued to try and remove the top of the pull start which is held in by 4 screws, 1 of the screws has a semi stripped head which wont move and the other I can't get a spanner or socket on, is there any other way in to the sprag clutch or should I try and drill these screw out?

[Linked Image from use.com]