O-RING replacement.
If you remove your starter very much, ie for jetting changes (yes it's way easier to remove the starter when making carb changes), you will loose that O-ring fairly quickly.
The cross section of the O-Ring is 3.2mm.
the ID is approximately 24mm.
The Inspection plate gasket is available direct from Cometic.
It's actually listed as a Honda number through Cometic but it's the same for the Kawasaki.
HON CR500 PANTHERA E-START .018" AFM STARTER CAP
EC2184018AFM

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If bikes are for kids I'll never grow up.