I got a Doodle Bug with the 6.5 horse upgrade.Keeps throwin the chain.It has a small steel strip with a pulley bolted to the frame that you move to adjust tension.Theres no motor adjustment(fixed hole).You just loosen the bolt and move the bracket/pulley to adjust tension.B.S. :hammer:Anyone here come up with a better 20th centry way to address this.Pics would help Thanks!!