If you're regularly taking your bike onto rougher roads or trails then absolutely - using a proper chain tensioner will help protect both your engine and transmission from unnecessary wear and tear." A motorcycle chain tensioner is a device that helps to keep the chain on your motorcycle at the proper tension. They work by allowing you to adjust the tension on the chain, and they also help to protect your chain from coming loose and falling off. There are many different types of motorcycle chain tensioners available, so it is important to choose one that will work best for your particular situation. Most tensioners can be adjusted with a simple wrench, but some may require special tools. It is important to read all instructions before attempting to adjust or use any type of motorcycle chain tensioner.