1978 Yamaha TY250 Service and Repair Manual

Trials machines get taken apart more often than most bikes, which makes the factory reference worth having close by. For the 1978 TY250 that reference is LIT-11626-00-63, and the model code is TY250D. Coverage is the 1978 model year.

Because the book is specific to that year, the figures in it are not compromises reached across a longer production span. Inspection limits, torque specifications, disassembly and reassembly order, fuel and ignition settings and the original wiring diagram all apply directly to this machine.

The writing assumes competence and does not pad. It tells you the sequence, the figure and the limit, and leaves you to do the work.

Verify LIT-11626-00-63 and the TY250D code before you order.

Owners tend to keep it beside the bench for exactly that reason.