Here's why:
* Engine variations: Even within the same model year, there can be variations in engine components. Yamaha may have made changes to the cylinder design between the TY 175 and MX 175 models, or even within the same model but different production runs.
* Compatibility issues: Even if the cylinders appear similar, there could be differences in bore size, mounting points, or other critical dimensions that would prevent a direct swap.
Recommendation:
* Consult a Yamaha parts diagram: The best resource would be to consult a Yamaha parts diagram for both the 1975 TY 175 and 1974 MX 175. Compare the cylinder part numbers and specifications to see if they are compatible.
* Contact a Yamaha dealer or specialist: A knowledgeable Yamaha dealer or motorcycle mechanic specializing in vintage models will be able to provide accurate information on compatibility.
Important Note: Attempting to use incompatible parts could lead to engine damage or malfunction.