I just did my first conversion. I used an REI Coop 1.2 and added a CYC Photon to it. Since it has torque sensing I did not add a shift sensor. The chain line is straight when in a mid-gear. My problem is that the rear derailleur is now very sticky and does not want to shift. This is the case even if I take off the pedal assist and use no power from the motor. I thought it might be due to a cheap derailleur but I changed that out for a Shimano Deore since that was supposed to have a nice strong return spring. Any suggestions? Any help would be appreciated.
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i use waxed chains now fixed my shifting.
I’d be looking at a pinched cable somewhere. Does it let shift one way (to a lower/ bigger sized cog) and not to a harder gear (smaller cog)? If so you definitely have a pic chef cable/ cable housing somewhere. Or a bent shift cable if it was recently tinkered with.