1974 Yamaha TY80 Service and Repair Manual

The little TY80 was documented by Yamaha under part number LIT-11624-51-00, for the 1974 model year, with TY80A as the model code.

Small bikes are where a lot of people learn to use a torque wrench, and this is the reference that tells them what the factory actually asked for. Assembly sequences, inspection limits, carburettor and ignition specifications and the original wiring diagram are set out as Yamaha wrote them, with fastener figures given alongside the steps they belong to.

Surviving examples are usually well used, so the wear limits matter as much as the procedures. Knowing where the factory drew the line between serviceable and finished saves both money and a second teardown.

Confirm LIT-11624-51-00 and the TY80A code against your machine.