919 chain slack measurement
My manual is fairly useless on the subject as it doesn't tell me what state the bike needs to be in to take the measurement. On side stand, standing on its own, standing on its own with rider on, etc.
On my xr650, i basically got my base measurement and settings by bringing the swing arm up to put the front sprocket center, swing arm hinge center and rear axle center in horizontal line, and then checked tension and made myself a stick i could easily check for loose/tight.
I've seen people mention 30-40mm here for chain slack... but not how the bike was sitting to check it.