KCB returned to the summit of the Kenya Premier League after top scorer Clifford Alwanga netted the all important goal against the lowly flower men at City on Sunday
The league's top scorer so far Clifford Alwanga netted the only goal after 36 minutes after completing Brian Osumba's effort.
Osumba was a constant threat to the bankers side with his dangerous crosses that went begging most of the time.
The win pushes the bankers back to the top of the standings on 11 points. Sunday they were in third place after Chemelil Sugar won 2-1 against Nairobi City Stars the previous day.
It was also the first time that there was a change in the standings since the season kicked-off.
The win is the third by the bankers who opened the season with a 4-0 win over City Stars and then followed it up with a 6-0 thumping of Muhoroni Youth.
The bankers were then held to a barren draw by league champions Tusker before settling for a 1-1 tie with Sony last weekend.
For Karuturi, this is their second straight defeat. Last weekend, they went down 2-1 to City Stars in Naivasha and will have to rediscover their winning ways before it is too late.
In another match, Thika United humbled Muhoroni Youth 2-0 away to keep pressure on the league leaders.
Harambee Stars winger Clifton Miheso scored the first goal for the winners in the 21st minute while Ezekiel Odera added the second six minutes later to ensure the visiting side picked all three points away.
Though beaten at home, Muhoroni also had chances of their own with Geoffrey Simiyu an open chance in the 45th minute when he hit the side netting.
The league continues on Wednesday with two matches on the cards. 2009 champions Sofapaka take on Mathare United while Gor Mahia plays host to Ulinzi Stars. Both matches will be played at the City Stadium.