Just got a message back from Barnett engineering and thought would pass on information since no one seemed to know differences.


From Barnett email:

- DS650 stack height is 39.624 mm thick.
- Both plates are 3mm thick. Inner plate thickness varies (9/8 stack: 1.578mm/2.232mm) and must be the same per set.
- Carbon fiber material is same for both kits.
- DS650 match up to common Kawasaki plates.

- Clutch springs for DS650 pn MT-14-6 are 10-15% stiffer than standard and retail $17/set.
- Same clutch material is in any type clutch and Barnett will match up any clutch/liners/springs if send them the complete stack/springs.


From my BMW F650 shop manual:

- F650 stack height is 35 mm thick.
- Plates are 3.42857mm thick. Inner plate thickness is 1.8333 mm.


Conversion Calculations:

1. Since my inner plate thickness of 1.8333 is near low end of 9 stack inner plate thickness (9/8 stack: 1.578mm/2.232mm),
to add a plate, I'd have to go with DS650 (13.2%) thinner 3mm clutch plates (8x3=7x3.42857=24mm)

2. The inner liners would have to be 1.5714mm thick, 0.0066mm less than 9 stack liners of 1.578mm.

3. My max distortion of lined disc is up to 0.15mm minus (0.0066 x 7=0.0462mm) would leave me a new 10.38 mm max distortion (31% less max distortion).
Close, but I'd have to verify with Barnett with actual clutch/liners/springs. But seemingly for more grab and maintenance, I could just use 8/9 DS650 clutch sets assuming all other interfaces in the clutch basket fit.

:-)