Using a Royal Enfield's old model silencer on a Pulsar 150 can potentially affect the motorcycle's performance and fuel efficiency (average). The silencer plays a crucial role in the exhaust system, including back pressure and the flow of exhaust gases.
The Royal Enfield's old model silencer is designed specifically for Royal Enfield motorcycles, considering their engine specifications, exhaust flow dynamics, and noise regulations. It may not be optimized for the Pulsar 150's engine characteristics and exhaust system.
When you replace the stock silencer with a different model, it can alter the back pressure and exhaust flow dynamics. This change in exhaust dynamics may affect the air-fuel mixture and engine performance, resulting in reduced fuel efficiency and potentially impacting the motorcycle's average mileage.
Furthermore, modifications to the exhaust system can also affect the emission levels and may not comply with local regulations. It's essential to ensure that any modifications made to the motorcycle are legal and do not violate emission norms or noise regulations in your region.
If you are experiencing a decrease in fuel efficiency after installing the Royal Enfield's old model silencer on your Pulsar 150, it's advisable to revert to the stock silencer or consider getting an aftermarket silencer specifically designed for the Pulsar 150 to maintain optimal performance and fuel efficiency.