valve tappet adjustment

[attmchappo]

alright so i bought a carburetor rebuild kit. ive yet to rebuild it tho. but yesturday i was driving the bike and it was running really good all of a sudden one cylinder cut out and i took it home. and there was a hole in the cylinder cap where the stud on the rocker broke through.the stud was really loose and had backed out. i was curious first of all what would cause that. second of all what is the specs for the tappet clearance. its a 1965 honda 305 cb77.

[joeweir1]

The CA77 is .004, not sure if the CB's are the same. Maybe it was just loose from previous adjustment. Did you check before starting bike?

[lrutt]

that would made a hell of a racket for quite awhile if it really backed out. Did you not hear that? Run a rocker arm .010 loose and you can really hear it. To hammer a hole in the cap it would have been .10 and more out. One hell of a noise.