Younus (136) dominated the partnership and the hapless Sri Lankan bowlers to complete his 23rd test hundred with a cover-driven four off left-arm spinner Rangana Herath.
The stylish right-hander, 36, hit 19 fours and a six before being bowled by paceman Shaminda Eranga.
Captain Misbah went into a shell as he neared his fifth test hundred but reached the mark in 241 deliveries with a single off Sachithra Senanayake.
The 39-year-old was unbeaten on 105, including 13 fours, at stumps. Asad Shafiq (12) was the other not out batsman at the crease.
Resuming on 46 for one wicket, Pakistan lost Mohammad Hafeez (11) early when the right-hander was caught by a diving Kaushal Silva at short cover off paceman Suranga Lakmal.
Eranga then forced debutant Ahmed Shehzad (38) to miscue a pull shot straight to Dimuth Karunaratne at square leg to reduce Pakistan to 83 for three.
But Sri Lanka were denied any further success till late in the final session as both the faster bowlers and the spinners struggled to extract anything from the docile wicket.
Herath and off-spinner Senanayake bowled 49 overs between them out of the 109 in the innings but rarely troubled the Pakistan batsmen.+
(Writing by Sudipto Ganguly; editing by Ed Osmond)
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