1974 Yamaha GP433F Service and Repair Manual
Look up the 1974 GP433F in Yamaha's literature and you land on LIT-12618-65-00, the volume that also serves the GP338F. The two sleds shared enough of their construction for the factory to document them in one place, and the tables separate the figures that are not common to both. Model code for this machine is GP433F.
The manual moves through the sled the way a shop does: inspection and measurement, then disassembly, then the specification the part has to meet before it goes back in. Torque values are given throughout, carburetion and ignition settings are tabulated, and the wiring diagram is printed for tracing an electrical fault instead of guessing at it.
Quote the part number when you are checking coverage — codes from this period repeat across chassis and the number is the only unambiguous handle.