You need to have the valves adjusted. If they are not done soon you will have to replace more parts. Also do a oil change and filter change.
You can't adjust the valve lash in a kawasaki 1500....because they use a automatic hydraulic valve lash adjusters on the end of the valve rocker. Its self adjusts with the oil pressure increase from higher rpms. As soon as you apply the throttle you should not hear the tapping because the lash adjuster needs pressure to work properly. The only fix is to pull the motor and replace the adjuster like I did. My custom 1996 kawasaki vulcan 1500 classic (big red) graced the cover of motor cyclist in 1998 so I know what I am talking about.
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Engine stalls or RPM fluctuates at idle up and down.
This problem
is commonly caused by a dirty automatic idle speed control valve and
throttle valve but always run a OBD2 fault code as well as the
cleaning procedure. Buy a can of throttle valve cleaner (do not use
carburetor spray cleaner!) from NAPA or Carquest (made by CRC
chemicals) and spray it into the air intake while the engine is
running, use up about 1/2 the can, engine will try to stall hold the
speed up, shut it down and let it soak for 30 minutes, restart and
blow out the remaining fluid, shut it down and disconnect the
negative battery cable for 5 Min's to reset the base idle control
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