Apparently the Factory Pro shift spring causes premature wear in other parts. Form another forum:
Can you tell me why you dont sell the kit (spring and detent plate ) for the S1000RR, because i would like to advise future purchasers of your spring that yes it gives you a more positive gear change, but i think by not mating the spring with a hardened shift star (detent plate) you get premature wear on the shift star...thus causing shift lever hang which increases the more miles you do..
I have your detent spring fitted, 7000 miles down the road and my lever is hanging more and more, the extra pressure on the internal lever arm is flattening off the shift star high spots.....i see your kits for other bikes sell with a shift star why not ours..as you are aware the internal lever has a roller bearing that runs up and down the peaks and troughs of the shift star (detent plate) and that roller bearing is harder that the shift stars surface thus wears more the higher the tension of the spring...regards
That's interesting-it certainly works short term.I took mine out because I found the shift too stiff.
Funnily enough,I haven't had the missed-shift problem since but I have also changed my boots.
I rode the bike the other day,using my old boots,and guess what?,I had a few mis-shifts!