I would remove the tensioner and see if I can shorten the chain enough to run without the tensioner. I've run without a tensioner for two years now. Depending on how the chain fits you may have to fiddle with some stuff to get the tension right, there are half links available, I used a small metal shim between the motor and the rear motor mount to add a little tension to my chain cause it was just a tad loose...
I love the bike without the tensioner, it has much less drag and mechanical noise from the motor chain.
I love the bike without the tensioner, it has much less drag and mechanical noise from the motor chain.