Chittesh Mandodi (Mohite's Racing Academy) from Kolhapur and Bangalore siblings Arjun and Kush Maini emerged champions in the senior, junior and micro max categories in the JK Tyre-FMSCI National Karting Championship that concluded here yesterday. The three champions, however, were made to work hard for their success as going into the fifth and final round here over the weekend, none enjoyed clear-cut leads.