Does Sasuke also remove Kurama's memories when they time travel? In the arc where Sasuke and Boruto time travelled to the past, It was mentioned that Sasuke removed the memories of everyone, well except for Kurama. Did he really forgot to remove it? or Kurama kept it all this time?

..Boruto Episode 136
There is no evidence that Sasuke removed Kurama's memories too. so, I believe Kurama knows everything.

I only remember the first time when Sasuke entered naruto. 


  Tenchi Bridge Reconnaissance Mission
  
  Sasuke, with his active Sharingan, suddenly appeared within Naruto's
  subconscious, which surprised both Naruto and the Nine-Tails. The
  Nine-Tails became impressed with Sasuke's growth and ability, but as
  it stated that Sasuke's chakra was similar to Madara Uchiha, Sasuke
  effortlessly suppressed the fox's residual chakra with his Sharingan.
  Although angrily shocked by the display of his power, the Nine-Tails
  concluded that this might be its last meeting with Sasuke, so it
  warned him not to kill Naruto, because he would only end up regretting
  it.


it simply means even if Sasuke tries to enter inside naruto and talk to karuma the beast will not listen because karuma hates human and the human he hate most is UCHIHA MADARA. Also in many later episodes when naruto got lot of control over karuma. karuma always used to try to influene naruto to hate human of what they did to him. he wants to make naruto like himself. he also tries to make him remember Sasuke betrayal every time. so that means even karuma unable to recognize Sasuke.