I was told recently that quick shifters functioning properly depend on your chain slack being correct. It’s printed on your swing arm on a sticker.I have yet to come across on a post asking this question if there is some I am sorry for asking again!
2019 cbr1k with quick shifter “stock foot pegs” I have done everything to run GP shifting cut the plastic to make it fit. The ONLY problem I am having is when shifting into gear sometimes it’s super hard to go into gear like if the quick shifter isn’t reading the changing of gear right any ideas or thoughts thanks a lot!
See picture below
I was also told that 20mm-25mm is also an acceptable amount of chain slack for your quick shifter to function properly.
I had a problem with my OEM Honda quick shifter on my 22 CBR 1000 RR.
The rod that connects the transmission spline to the shift foot lever was slightly rubbing against a frame cap I installed. Not very much. It was actually very hard to tell that it was rubbing at all. Once I spaced it out a little further away from the motorcycle, my quick shifter stopped being moody. And started working perfectly.
You might want to check these things.