Originally Posted by David Contreras
i got a bike a few months ago , after having it for 2 m onths the lifters started mkaing anoise ike valve tapping.
i took it motocycle shop and they found2 bad lifters and replaced all 4 on that head.
for 24 hrs it sounded great
now the tapping i sback in ths same spot how is this possible 4 brand new lifters
Hydraulic Lash Adjusters (used on our Kawasaki 'overhead cam' engines) handle the adjustment of your valves (valve-lash), hydraulically. They do the same job, but a little differently than Hydraulic Valve Lifters (used with engines with push rods). They look differently, than valve lifters, but both use the engine's oil to allow some 'lash' in the valve adjustment. It is an automatic system - you never have to adjust your valves.
Engines that use manually adjusted valves don't automatically adjust the valves, they must be periodically adjusted by a mechanic ( either by use of shims or adjusting screws).
Hydraulic Lash Adjusters (H.L.A.s), will drain out, when the bike sits for awhile. They will tap when first started, but should disappear after you ride a good distance.
If your Kawasaki just has a small, temporary tick, when first started, after sitting for several days, it is not uncommon. This generally is not as big a deal as the old, "Noisy Valve Lifters" complaint on car engines.
As far as your mechanic replacing them before, I don't know - maybe he did find a bad one and decided to replace them so you would rule out bad parts. Anything mechanical can fail, but in future, see if the tick goes away by running it. Mine will tick, if it sits for a few days, too. Good luck!