The new steering head bearing arrived, so I swapped over the original lower yoke/clamp, for the later model version and went for a ride.
The crank is obvious when you compare them side by side
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The lowest clamping point on the fork leg is moved down by 30mm
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The clamping boss on the later model is 40mm wide, while on the early version it's only 35mm
It's easy to say that Yamaha must have thought this was a worthwhile mod to make, because it uses more metal and needed new dies to be made, but I wasn't sure if I would feel a difference
On my favourite fast sweepers of the A70 I believe I can feel a more settled stance, especially when riding more up on the edge of the tyre than on the centre. It also feels less disturbed by undulations and hitting catseyes.
I don't know if I would suggest changing it as a matter of course, but I've only had 30 minutes of testing so far, but if you had a reason to change the 900 lower yoke I think the newer version is the right one to go for.
And a special note about the Zyliss bench vice. I bought this just because of it's wide opening, but it's a lightweight alloy, so I didn't think it was going to be strong. But, it's Swiss made, and if all you have room for is a temporary vice, it's probably worth a look !
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Edited by fixitsan, 24 July 2024 - 02:54 pm.