Re: Chain tension problem
Did the idler rotate inwards towards the wheel? That is pretty classic. These little engines vibrate like the dickens. Things need to be kept TIGHT-TIGHT-TIGHT. Good lock washers, lock nuts, and Loc-Tite adhesive get to be our serious friends. Glad you weren't hurt and had fun!
I highly recommend a spring-loaded self-adjusting tensioner. There are after-market ones on the web, or you can easily make your own. Just a thought. Good Luck!