It is technically possible to install the rear disc brake from a Honda CB Hornet onto a Yamaha FZ, but it would require significant modifications and may not be a straightforward process. Here are a few factors to consider:
Compatibility: The rear disc brake assembly from the Honda CB Hornet may not be directly compatible with the Yamaha FZ's frame, swingarm, and wheel. The mounting points, caliper bracket, axle size, and rotor size may differ between the two bikes.
Modifications: To fit the Honda CB Hornet's rear disc brake onto the Yamaha FZ, you may need to modify the mounting points, fabricate custom brackets, or make other alterations to ensure proper fitment. This process typically requires advanced mechanical skills and knowledge.
Hydraulic System: The Yamaha FZ may have a different hydraulic system for the rear brake compared to the Honda CB Hornet. This includes the master cylinder, brake lines, and the rear brake pedal mechanism. You would need to ensure compatibility and make necessary adjustments or modifications to accommodate the different components.
Safety and Legal Considerations: Any modifications made to your motorcycle should be done with careful consideration for safety. It's important to ensure that the modifications do not compromise the structural integrity of the bike or adversely affect its braking performance. Additionally, modifying the braking system may have legal implications, and it's essential to check local laws and regulations to ensure compliance.
Given the complexity and potential challenges involved in fitting a rear disc brake from a different model onto your Yamaha FZ, it is recommended to consult with a professional motorcycle mechanic or a reputable customization shop. They can assess the feasibility of the modification, provide expert guidance, and carry out the necessary modifications if deemed appropriate and safe for your specific motorcycle.