Ok , I started to get some loud valve noise all the sudden . I removed the valve covers to find one of the tappet nuts are gone and the tappet itself was almost gone too. My question is could it make its way down into the motor or should it be in the top end still ? It was running when i shut it down , and turns over fine . It s either setting somewhere waiting to do damage , or its been munched up and spit out .Im going to start opening it up and see what I can find . Any help would be helpfull . THANKS