10/25 River Value Raise?

[kafkaFan1]

6 handed, folded to SB we both ahve 2.5k stacks, he limps I check behind with K3. He is an unknown and not a skilled player. The flop comes K32, he check/calls $50. Turn is 8 putting two diamonds on the board, he leads out $25 and calls my raise to $170. River is 7o, and he quickly leads out pot of $460 or whatever it is.

I dunno, pretty good two pair here, but it is unraised. Hard to put him on a hand... can he call with worse? All in or call?