So i was going down the highway at about 170 km's and i suddenly hear a fast paced ticking sound, its not too loud and i didnt feel any loss of power and it still seems to pull the same but the tick is still there usually when the gas pedal passes about halfway. Im hoping my valves just need to be adjusted but it never did this ticking before so is it possible for valves to become loose at about 6000 RPM's? or did i blow something? I would think that if it was something really severe than it would have been fairly loud and possibly feel like my engine was falling apart or something. Any suggestions?