These engines are known for valve "tick" completely stock. And, yes, the timing chains wear out somewhat regularly on these engines as well. You will need to put the piston at top dead center of the compressions stroke. Then, remove the 12mm hex head bolt in the timing chain tensioner. Lastly, remove the tensioner from the cylinder, it has two 8mm head bolts. Once it is out, measure how far out the plunger is, then pull the plunger out the rest of the way to so see how much further it can travel. If it comes out a 1/4" or less, replace the chain. FYI, the tensioner is located on the back of the cylinder, on the left side of the bike. You will need a flywheel puller and stator cover gasket to replace the chain. A 1/2" impact makes removing the flywheel all the more easier.