What can be the maximum secondary voltage in a small engine ignition system?

In a small engine ignition system, the maximum secondary voltage can typically reach up to 30,000 volts. This voltage is crucial for generating a sufficiently strong spark at the spark plug, which ignites the air-fuel mixture necessary for engine operation. The ignition coils in these systems are designed to step up the battery voltage to a much higher level, enabling the creation of an effective spark that can bridge the gap at the spark plug.

The design and operation of small engine ignition systems generally limit secondary voltage to this range to ensure reliability, efficiency, and safety. Higher voltages, such as those presented in the other choices, are usually not necessary for the ignition needs of small engines, as they may lead to overheating and wear of ignition components or increased emissions. Therefore, 30,000 volts is a widely accepted upper limit for secondary voltage in these systems, making it the correct answer.