Just for reference purposes, here are some measurements I took today. Will retake them when I've clicked over 2000 km as things should have fully settled in by then. To get the full extension reference measurements, I had both wheels off the ground with my ABBA Superbike stand.
My weight with day clothes is approx 74kg. Didn't put on my riding gear for this test, but did have my tail pack on it containing a few tools, mini compressor and puncture repair stuff)
: Full extension (between machined area on hub/brake casting and bottom of fork seal is 160 mm.
Unloaded measurement 120mm. Unloaded sag 160-120 = 40mm. (Generally recommended range 20-25mm). Makes me wonder whether the Duke has progressive fork springs as the loaded sag was ok - just).
Loaded sag = 160-110 = 50mm (Generally recommended range 35-50mm).
I've also fitted a cable tie to one of the fork legs to check the dynamic dive. I'm not heavy on brakes for road use and so far, the cable tie gets pushed to 42mm above the machined area on the hub/brake casting which seems reasonable. I'll do some more work on this in due course to find out where it binds under full compression.
: Full extension (between top of swingarm and underside of grab handle - see photo) is 540mm.
Unloaded measurement 520mm. Unloaded sag 540-520 = 20mm. (Generally recommended range 15-20mm)
Loaded measurement 480mm. Loaded sag 540-480 = 60mm. (Generally recommended range 30-40mm). This suggests I could do with another click of preload.
I won't be touching anything until I've done a re-measure in the next week or two. It doesn't feel too bad at present. I was fortunate to attend a suspension course with international expert Dave Moss last year which was quite an eye-opener. As well as setting the bikes up statically, he also tweaked them over the course of a ride when the suspension oil got hot. I had the GSX-S 1000 at the time which had all-round compression and rebound damping too. There's a bit of detail and some photos in the last half of this blog post: https://geoffjames.blogspot.com/2018...lent-week.html
. Dave also does some excellent YouTube videos.