The issue
IF PROPER STARTING PROCEDURE IS NOT FOLLOWED, LEAN CARBURETOR SETTINGS REQUIRED FOR EXHAUST EMISSIONS MAY CAUSE BACKFIRE THROUGH THE CARBURETOR, CAUSING POTENTIALLY IGNITABLE FUEL DROPLETS TO BE ABSORBED BY AIR CLEANER. THE SAME CONDITION COULD RESULT FROM ENGINE REACHING OPERATING TEMPERATURE.
Transport Canada Vehicle Recalls Database · Contains information licensed under the Open Government Licence – Canada · official text, unchanged
Vehicles covered
| Make and model | Model years |
|---|---|
| Blue Bird ALL AMERICAN NON-SCHOOL BUS | 1972, 1973, 1974, 1975 |
| Blue Bird ALL AMERICAN SCHOOL BUS | 1972, 1973, 1974, 1975 |