Yes, the body of a motorbike does matter in terms of the size of the engine that can be accommodated. While it is technically possible to put a 250cc engine on a small bike, there are several factors that need to be considered.
Physical Space: A smaller bike may not have enough physical space to accommodate a larger engine. The frame, chassis, and other components of the bike need to be designed to handle the size and weight of the engine.
Weight Distribution: The size and weight of the engine can affect the overall balance and handling of the motorcycle. Placing a significantly larger engine on a small bike could result in an imbalance and negatively impact the bike's performance and stability.
Structural Integrity: The frame and other structural components of the bike need to be strong enough to support the increased power and torque of a larger engine. If the frame is not designed to handle the stress and forces generated by a more powerful engine, it could lead to structural failure and unsafe riding conditions.
Cooling and Ventilation: Larger engines typically generate more heat, requiring adequate cooling and ventilation systems. A small bike may not have sufficient space or airflow to dissipate the increased heat generated by a larger engine. Overheating can cause performance issues or damage to the engine.
It is important to note that modifying a motorcycle's engine or structure should be done with caution and expertise. It is recommended to consult with professionals or mechanics who specialize in motorcycle modifications to ensure that the changes are safe, legal, and appropriate for the specific bike model.