The 16-year-old Kini, who had won both of Saturday's races, displayed admirable car control during each of the eight-lap long races after he had secured pole with a time of 1:14.521.
While Kini, who has come through the karting ranks, built a comfortable lead in the first race, he had to stave off a late surge by Saran Vikram in the second. The two cars went wheel-to-wheel after they rounded the last corner, but Vikram, despite setting the fastest lap, could not find his way past.
With the double victory, Kini moved to 43 points in the championship table, while Vikram, who finished second in both races, went to 17. Ajith Narasimhan, with 22 points, is in third place.
In the Formula Esteem category, P.V. Bharat won the first race to make it three on the trot, but was forced to pull out of the second with a broken drive shaft. Bolliseti Sailesh from Vizag won race two.
The JK Tyre Racing Cup 2006, the brainchild of J K Tyre and Madras Motor Sports Club, gives an opportunity to those without race experience to compete at an affordable cost.
The results (all races eight laps):
Formula Maruti: Race I: 1. Ajay Kini 10:15:040, 2. Saran Vikram 10:17:490, 3. P. Vivekanandan 10:38:451; Race II: 1. Kini 10:08:851, 2. Vikram 10:09:064, 3. Sudrashan Rao 10:13:857.
Formula Esteem: Race I: 1. P.V. Bharat 10:49:241; 2. R. Sriram 10: 57:863, 3. Bollisetti Sailesh 11:01:512, Race II: 1. Sailesh 10:52:089, 2. Gautam Shankar 10:53:480, 3. R. Sriram 10:54:247.