Red Seal Motorcycle Technician Practice Exam

Which type of motorcycle engine is designed to operate on gasoline without the need for a separate lubrication system?

1. Two-stroke engine

2. Four-stroke engine

3. Electric engine

4. Diesel engine

The correct answer is: Four-stroke engine

The correct choice is based on the fundamental design and operation of four-stroke engines. In a four-stroke engine, the lubrication system is integrated into the engine's design, utilizing a specific oil reservoir that circulates oil to various moving parts. This allows for effective lubrication of components without the need for mixing fuel and oil, as is done in two-stroke engines. In contrast, two-stroke engines require a mixture of oil and gasoline for lubrication, as there is no dedicated lubrication system. Electric engines do not use gasoline at all and, therefore, do not require any lubrication system tied to fuel. Diesel engines also have a separate lubrication system similar to four-stroke gasoline engines, but they operate on diesel fuel rather than gasoline. Thus, the four-stroke engine's design is specifically geared towards running on gasoline while ensuring adequate lubrication through an integrated system, making it the correct answer to the question.