Installing an aftermarket exhaust on a motorcycle can affect the air-to-fuel ratio and the overall performance of the engine. While it may not always be necessary to tune the motorcycle after installing an aftermarket exhaust, it is generally recommended for optimal performance. Here are a few factors to consider:
Air-to-fuel ratio: Changing the exhaust system can alter the airflow dynamics, which may result in a leaner or richer air-to-fuel mixture. If the motorcycle's engine management system is unable to adjust automatically, a tune may be necessary to ensure the proper ratio for optimal performance and to prevent engine damage.
Backpressure: Aftermarket exhaust systems often have different designs and can influence the amount of backpressure in the exhaust system. This can impact engine performance and may require adjustments to optimize power delivery.
Fuel injection and carburetion: Modern motorcycles are equipped with fuel injection systems that are designed to adjust the air-to-fuel ratio based on various inputs. In some cases, the engine management system can compensate for minor exhaust modifications. However, significant changes may require reprogramming or remapping of the fuel injection system. If your motorcycle uses a carburetor, jetting adjustments might be necessary.
Manufacturer recommendations: It's advisable to consult the manufacturer's recommendations or contact a reputable motorcycle tuner for guidance specific to your motorcycle model and aftermarket exhaust system. They can provide expert advice on whether a tune is necessary and the best approach for your particular setup.
By tuning the motorcycle after installing an aftermarket exhaust, you can optimize performance, ensure proper fueling, and potentially extend the life of your engine. Professional tuners or motorcycle dealerships equipped with dyno facilities can provide accurate tuning services to achieve the best results.