Scam by JC brothers They are Alleged to have 66 rejected Bharat Standard (BS) III vehicles wrongfully enrolled and carried them to Anantapur from Kohima in Nagaland and sold them as BS-IV compliant. Difference between BS III and BS IV T he difference between these two engines mainly lie in their exhaust systems. Regulations restrict evaporation emissions from fuel tanks, which mean a new breather value and additional or changed stamps in the body structure or additional brackets that hold these new systems. This is very difficult to retrofit considering the fact that major design changes might be needed. BS IV engines require a larger catalytic converter to nullify the harmful nitrogen based gases and most bikes also need a secondary airflow system that adds oxygen (or natural air) to the exhaust stream just before the catalytic converters. But it is difficult to retrofit. Many manufacturers are adapting to the ECU (Electronic control unit) and ignition control setup which h...