A real good mechanic I know is the head mechanic for a township I live by. I asked him how many times he replaced a pto clutch on a lazer and he said he never has replaced one. He said if you rev then engine down when you engage the blades it reduces wear on the pto clutch greatly. I know some folks have had a problem w/ this and this may be common knowledge but I wanted to post it anyways to try to save some folks some $$. This is also recommended by exmark and toro in the manual from what I understand.