You did not list Make, Model, Year, or Engine Size. So all I can tell you is that the vast majority of vehicles with a timing chain have a self tensioner that keeps the tension tight. If the chain it loose or noisy then it is more than likely worn out or the tensioner needs replacing or both.
It has an automatic chain tensioner..
It has a self tensioner, Most often you have to replace the chain it self if it is skipping time or is getting very loose.
Check for excessive slack in the timing chain.
yes little nut on side lossen then tighten screw
how do you tighten a chain on a 150 ATV
Timing Chain
timing chain timing chain
timing chain timing chain
timing chain timing chain
No Belt=It has a Timing Chain.=
It has a timing chain
how to tighten the front chain axle