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What Kev said.
Steel in steel, by the time you have got about three full turns in the thread is stronger than the shank of the bolt. Steel in ally you need another couple of turns.
Add a bit of safety factor to that and you've got the 'rules of thumb' above.
The only reason there is more (unused) thread in the yoke is that it's easier and cheaper to drill and tap a through hole than a blind hole. Not because it's needed for strength.
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I spent a lot of money on travel and racing motorcycles - the rest I just squandered.
XT660Z -
Commuter, Adventurer...Racer?
www.dashmoto.net
Other bikes >> MT-03 / CG125BR-J / ER-6F
Departed >> ZXR400L3 / EC300 / DR-Z400E / DR800S / GPZ500S / GS400
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