I clutchless shift for upshifts probably about 50% of the time especially from 2nd gear up. 1st to 2nd is a bigger jump in ratio and it clunks harder for me so I clutch that one. The 2-3 3-4 are nice and the 4-5 5-6 are almost too smooth. Best around 7000rpm...
If I'm just puttering around I'll use the clutch and always for downshifting. I've tried clutchless downshifting but you can really screw that up and jolt the bike if you dont get the throttle correct. Up shifting is super easy.
To try - put the bike in 4th gear and slowly accelerate to 6000-7000rpm. As you apply pressure on the shifter upwards
slightly reduce the throttle and the gear will slide into place. Then you can go back on to the same throttle position. Its so easy youre going to laugh the first time you do it.
I dont pre-load the shifter anymore. I'm just shifting and throttling at the same time...I've done countless full throttle runs from around 30km/hr in 2nd to 170km/hr in 6th all without the clutch. I just love it
I'm not doing this to save clutch wear btw. I just think its smoother and also when riding hard I like to hang on to the bars with both hands...
lots of people will tell you that its hard on the gearbox...I thought so too...then I read this:
Clutchless Shifting - Sport Rider Magazine Online