One sweltering Saturday, with the manual propped open on a plastic stool, Lan began. The first task was an oil change and filter check. The manual showed a clean, exploded diagram of the engine case. Step 1: Warm the engine. Step 2: Drain the plug (17mm socket, 30 N·m torque).
Vroom.
He had done it. He hadn't just swapped parts; he had understood the intention of the engineers who built it. Yamaha Mt 15 Service Manual