Can anyone explain how a motorbikes steering movement is limited (assuming typical forks with a triple-tree yoke).

Thanks muchly!

there are stop blocks on the bottom yoke that connect to the frame when they are on full lock

Mine has cast lumps sticking out the frame which the yoke hits. They are only tiny blobs flattened off. The yoke has equivalent 'blobs'.

Cheers guys... it's something that I've never looked at on any of the bikes I've had!

Any rubber / plastic pads to prevent metal-on-metal?

Nope, not on mine anyway!

nope it all mental on mental on race bikes the use rubber on legs on the fairing stay so that hit the fork legs to reduce lock to stop tank slappers

Cheeeeeeeeeeers!