When modifying the intake system of a motorcycle by removing the airbox and installing a pod air filter, it can affect the air-to-fuel mixture and potentially require adjustments to maintain proper engine performance. Whether or not you need to change the exhaust system as well depends on various factors, including the specific motorcycle model, its engine characteristics, and the level of modification you're making.
Here are a few considerations:
Airflow: The increased airflow from the pod air filter may result in a leaner air-to-fuel mixture, which could cause the engine to run too lean. In this case, adjusting the carburetor's fuel mixture is necessary to ensure proper fueling. A professional tuning or rejetting of the carburetor may be required.
Exhaust: If the new intake modification significantly alters the engine's air intake characteristics, it might be necessary to adjust the exhaust system to match. A high-flow exhaust system designed to complement the increased airflow from the pod air filter can help optimize engine performance. However, it's not always mandatory, and some motorcycles can run well with just an intake modification.
Overall balance: Modifying only the intake without addressing the exhaust system may result in an imbalance in the airflow dynamics, affecting the overall performance and efficiency. A professional motorcycle tuner or mechanic can help assess the specific requirements of your bike and suggest the best approach.
It's important to note that modifying a motorcycle's intake and exhaust systems can have legal implications, affect emissions, and potentially void warranties. Therefore, it's advisable to consult with a knowledgeable motorcycle mechanic or tuner who can guide you through the modifications and ensure your bike runs optimally and complies with local regulations.