FJ-09 OEM Shock Valving vs FZ-09 OEM Shock Valving

Here is some info on the comparison between the OEM FZ-09 shock and the OEM FJ-09 shock. Both use the same piston internally and neither have any type of bleed drilled into the piston itself. Both are IFP design and both have the same shaft travel. The spring remains unchanged from the FZ-09 to the FJ-09 as they were close enough in rate FZ-09 9.8 kg/mm FJ-09 9.9 kg/mm.

Here are the shims stacks in OEM configuration.

FZ-09 Compression

34    0.15

34    0.15

32    0.1

32    0.1

30    0.1

30    0.1

28    0.1

24    0.1

22    0.1

18    0.15

16    0.68

FJ-09 Compression

34    0.2

34    0.2

34    0.2

34    0.2

34    0.2

34    0.2

34    0.2

34    0.2

32    0.2

28    0.2

26    0.2

24    0.2

20    0.2

18    0.2

15    0.69

Graph showing the different compression damping curves:

FZ-09 Rebound

32    0.15

32    0.15

32    0.15

32    0.15

32    0.15

30    0.25

30    0.25

28    0.25

28    0.25

26    0.25

26    0.25

24    0.25

22    0.25

20    0.25

18    0.69

18    0.69

18    0.69

18    0.69

FJ-09 Rebound

32    0.3

32    0.3

32    0.3

32    0.3

32    0.3

32    0.3

30    0.3

30    0.3

28    0.25

26    0.25

24    0.25

20    0.68

Graph showing the different rebound damping curves:

IMO the OEM FJ-09 shock seems a bit overdamped especially since it has the same rate spring as the FZ-09.

Hope this sheds some light on the differences between the two shocks.