Yamaha GX750 Triple-Cylinder Context
Yamaha's product history records the GX750 in its 1976 motorcycle lineup. Yamaha describes it as a road model with a compact transverse DOHC three-cylinder engine and shaft drive, and notes that a later GX750II revision adopted a different exhaust layout and increased output. Those revisions make exact year and engine identification important even within one GX750 family.
PartsNMore's current exact Yamaha GX tag contains one engine gasket set listed for GX750 applications from 1976 through 1980. The same product is also cataloged for XS750 variants across those years, but the listing and installed engine remain the final fitment authorities.