"At this level it is important that you kill the game when you are on top," said Kimanzi.
Captain Chrispin Oduor scored a first half brace and assisted Nyakeya's winner.
Kimanzi has stuck to the first eleven that beat Tusker 2-1 last weekend.
"If we continue like this then we can dream of the title,” said the Kenya Under 23 international.
Johnstone Omurwa and James Kinyanjui scored in either half.
Chris Ochieng' has been rewarded for his positive impact against Gor Mahia last weekend.