The RF900 has a larger displacement engine (937 cc) than the RF600 (599 cc). This gives the RF900 more power and torque, making it a faster bike. The RF900 also has a longer wheelbase and a wider rear tire than the RF600, which makes it more stable at high speeds.
In terms of fit, the RF900 engine is wider than the RF600 engine. This means that it will not fit directly into the RF600 frame without some modifications. However, it is possible to swap the RF900 engine into the RF600 frame with some custom fabrication work.
Overall, the Suzuki RF900 and RF600 are both great sport motorcycles. The RF900 is a more powerful and faster bike, while the RF600 is a more nimble and lightweight bike. Ultimately, the best bike for you depends on your individual needs and preferences.
If you are considering swapping an RF900 engine into an RF600 frame, it is important to consult with a qualified mechanic to ensure that the job is done correctly.
