Is it true that ignition timing is variable on all models?

Ignition timing is a crucial aspect of engine performance, but it is not variable on all models. Most traditional and older engine designs utilize a fixed ignition timing configuration, which means the timing is set and does not change during operation. This design was common in many older motorcycles and vehicles because it simplifies the engine management system.

In contrast, modern engines, especially those equipped with advanced electronic control units (ECUs), often feature variable ignition timing to optimize performance, efficiency, and emissions across different operating conditions. This allows the engine to adjust the timing dynamically based on factors like engine load, speed, and temperature.

The distinction between older models with a fixed timing and newer models with variable timing is key to understanding why not all models share this characteristic.