Tyrphanax said:

I believe the EU states that that year was spent looking for Solo, as well, so no time to visit Yoda.

At the closing of Empire Luke agrees to meet Lando on Tatooine, it seems to be knowledge to them & the audience that Fett is taking Solo to Jabba....so a year looking for Solo doesn't sound right.

For the gang to meet up on Tatooine soon after Solo was delivered to Jabba to perhaps test security....then set up infiltration, perhaps they had to be pulled into another battle....but there was plenty of time for Luke to revisit Yoda