Try about a quart of ATF or of Marvel Mystery Oil, or some Redline
Lifter Freer-upper in the crankcase (do not over-fill).  This worked for
me (Marvel Mystery) and has worked for many others.  I changed the oil
after a couple of hundred miles, but i still put about a pint of the
mystery oil in with the new oil to allow the cleaning to continue, which
marvel reccomends.
steve

Kenn Draymon wrote:

> I have an 85 GL 100,000 Km. with a distinct valve noise knock. The
> noise
> subsides somewhat when it warms up. I assume it is caused by a leaking
>
> hydraulic valve lifter.
> I thought about replacing all the lifters on spec, but wonder if
> anyone
> would share the benefit of their experience.
> Would pulling each lifter to identify/replace the leaking one be
> feasible/possible?  Or is the "shotgun" approach the way to go?