I got a GO586 a couple of weeks ago and finally had a chance this weekend to really put some time on it. It cut beautifully and I love having the long bed. However, when I start it up it jolts a bit. I think it's because there is too much slack in the belts. Does that sound right? If that is the issue are there any secrets to increasing the tension on the belts. The gravity method/ weight of the motor doesn't seem to be working.