Originally Posted by PatrickM
Well, size doesn't always mean better. There are a myriad of shock options and things like air shocks, progressive versus straight springs, dampening rate, etc. can affect a ride a lot more than the size.
But yeah, a reduction in size w/o any additional information means it's a downgrade.
I'm not suggesting that size has anything to do with dampening but decreased diameter means less rigid forks (everything else being equal or course). 48mm WPs from a KTM will flex less than the 45mm Marzocchi's on the pre 2013 F800gs and those will flex less than the 43mm WPs on a new F800gs.
Those 43's don't look like they have any adjustments anywhere. Appears to be the same allen bolt on the bottom and standard cap on the top. Like Lukas said, hopefully they didn't crimp the bottom of the cartridge this time allowing re-valves to be preformed. Maybe the guys with the 2013-newer F8's will have some luck finding adjustable WP donor internals like some of us have done with the Marzocchi Shiver 45s