Cheerz redlined_KX500 for the "Heads Up"
Kawai dealer here in New Zealand quoted 8 hrs to replace the crank seal, presume he meant motor still in the bike, another motorbike shop quoted me 6 !/2 hours with thge motor out at $55 an hour.
Need now to get hold of a cylmer manual and have a look at difficulty.
$100 here for the manual lolol but should still be worth it.