Please read the article and answer the following questions with complete sentences. The more detailed you are, the more credit your answers will get you.

Article: https://www.carandbike.com/news/are-two-stroke-engines-making-a-comeback-1672384

1. Who still makes 2 stroke engines?

2. Why did 2 stroke engines lose popularity?

3. What is different about modern 2 stroke engines compared with the 2 stroke engines of the 80s and 90s?

4. What advantages do the modern 2 stroke engines have compared to 4 stroke engines?

5. What are the challenges for manufacturing road legal 2 stroke engines?

Finish reading chapter 5 and answer the review questions at the end of the chapter.

Answer the following questions after watching the short documentary.

1. Where is said to be the “birthplace” of mountain biking?

2. From your observations, what major changes do you notice about mountain bikes now, compared to the first ones?