FAILURE OF THE PILOT TO PERFORM THE BEFORE-TAKEOFF CHECKLIST, AND HIS FAILURE TO ABORT THE TAKEOFF DUE TO INADEQUATE ACCELERATION. CONTRIBUTING TO THE ACCIDENT WAS AN INADEQUATE ANNUAL INSPECTION BY MAINTENANCE PERSONNEL FOR FAILURE TO SAFETY THE CARBURETOR HEAT CONTROL CABLE, WHICH RESULTED IN THE DISCONNECTION OF THE CARBURETOR HEAT CONTROL CABLE FROM THE CONTROL ARM AND INADVERTENT PARTIAL ACTIVATION OF CARBURETOR HEAT.