I would like a new or used chain tensioner for concentric drive scrambler 400's. I've heard a lot of grippin' about chains breaking, and I want to prevent this from happening. Will this solve the problem. Are they easy to install? Thanks!

 

HPD has one for the concentric drive models. The cost is $54.95.
I've got one on my TB and it was easy to install as far as does
it work, well I haven't broke a chain since it was installed. But
I had my TB for 2 years before I broke the stock chain! I have jumped
off the same jumps that broke the stock chain and so far the chain
tensioner is working as advertised!

hpd website