[johng952]

The timemaster doesent have any safty switches it only has a magneto ground shut off. It sounds like the engine rpm is way too low to try to engage the blades. I think the govener spring bracket might have been bent or the spring could have even came off not allowing the engine to reach the correct rpm before trying to engage the blades. I think there should be a guard to protect it from being hit by branches or anything else at that height that could bend the bracket or pull the spring off. I would look at the govener spring bracket and spring to see if something is bent or missing.