I have a 1981 Yamaha XT250H.
This motorcycle uses a single cylinder engine with a single overhead cam and two valves. The timing chain has two guides, one on both sides of the timing chain. The adjuster threads into the cylinder block on the right hand side. It uses a piston and a spring to adjust the timing chain. To get the tension anywhere near correct I have to turn the adjuster all the way in. There is no way to get the cover back on after that.
Does this indicate my timing chain needs to be replaced?