Decided to do it in the twilight. Lubed the crank shaft with 2 drops of oil and no squeal on starting up. Ran it around the yard for a couple of minutes no squeals, engaged the blades and she squealed. It also squealed at one point later on with blades disengaged at high revs, but at low revs it doesn't squeal. What should I do now? Here are some pics.. By the way it says the images will be click-able for larger but they are not?