1978 Yamaha DT250 Service and Repair Manual

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The DT250E of 1978 is covered by LIT-11616-01-44. Yamaha used that book for the 1977 and 1978 DT250 and for the DT400 as well, which is why the specification tables are laid out by model and code rather than as a single column.

So the first step is reading DT250E off the frame plate and then using the column that matches it.

Beyond specifications, the manual is a working procedure set. Engine assemblies come apart and go back together in the order the factory laid down, with the inspection measurements that decide whether a component is reusable. Torque values are given. The chassis sections cover forks, shocks, brakes, wheels and steering head. Electrical work is supported by the wiring diagram and by resistance and continuity figures for testing.

The troubleshooting tables are grouped by observable fault, which is how a no-spark or a fouling problem gets narrowed down without replacing parts at random.

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