Code YW50FXFL, 2015 model year, book LIT-11616-27-46. Yamaha wrote that volume for the ZUMA 50FX and its coverage spans 2014 to 2018.
For an owner doing the work, the useful parts are the ones that give numbers. Valve and engine clearances with their limits. Torque specifications for every fastener that carries load. Electrical test values to compare a reading against. Belt and roller wear figures on the automatic drive. Those are the things guesswork cannot supply, and they are why the factory book is worth having over a generic one.
The rest is procedure: maintenance intervals, engine and drive-train service in the correct order, chassis and brake work, wiring diagrams, and troubleshooting arranged by complaint. Verify YW50FXFL against your frame, note LIT-11616-27-46, and read the year callouts where the text gives them.
