What is a potential consequence of improper magneto timing?

Improper magneto timing can lead to higher exhaust emissions primarily due to incomplete combustion of the fuel-air mixture. When the ignitions sparks occur at the wrong time, it affects the timing of combustion within the engine's cylinders. This mistiming can result in fuel not burning efficiently, which causes unburned fuel to exit through the exhaust system. Consequently, this leads to elevated levels of pollutants, such as hydrocarbons and carbon monoxide, in the exhaust emissions. Additionally, because the combustion process is less efficient, the overall performance and fuel economy of the engine may decrease, further contributing to increased emissions.

In contrast, timing that is optimal would ensure better combustion efficiency, reducing harmful emissions and improving engine performance overall.