Ticking noise in engine .louder when warm.is it the cam chain

A ticking sound that gets louder as the engine warms up usually is an indication of the valves need adjustment. The clearance between the valve stem and the tappet on the rocker arm will get larger over time and needs a periodic adjustment. The cam chain can make noise as well, but "usually" more of a continuous noise that will change with rpm's (may quieten when accelarating/deccelerating). If it is the valve clearance, it is not an immediate concern, but should be adjusted to prevent unnecessary wear on the tappet/stem. Another way to tell is if it quitens somewhat with an oil change. Newer oil will provide more of a dampening effect on the contact between the stem and tappen, thus reducing the noise.