The compatibility of chain sprockets between different motorcycle models can vary. While both the Yamaha R15 and FZ series motorcycles are manufactured by Yamaha, it does not necessarily mean that the chain sprocket from one model will directly fit onto the other.
The R15 and FZ series motorcycles have different specifications and components, including variations in their engines, transmission ratios, and overall design. These differences can affect the size, tooth count, and overall dimensions of the chain sprockets used.
To determine if the chain sprocket from an R15 can be fitted onto an FZ model, it is best to consult with a knowledgeable motorcycle mechanic or Yamaha authorized service center. They will have the expertise and access to technical information to provide accurate guidance on compatibility and any necessary modifications that may be required.