gz250 ticking
 

wife bought a 250 marauder as her first bike. everything works well,low kms(12000kms) great shape.However,it has a noisy ticking sound. I'm not familiar with these, do I have to set the valves? and if so at what clearance? the bike came with no owners manual or anything else. Specs? can I download a manual or can anyone email me one? thanks