Why do 2 strokes have a fat pipe?

Related questions

1. Why are 2 strokes so loud?
2. Are two strokes street legal?
3. Which is faster 2 or 4 stroke?
4. Are 2 strokes road legal?
5. Can 2 strokes be fuel injected?
6. Can 4 stroke have powerband?
7. How much horsepower does a 250cc motorcycle have?
8. Which is better fi or carburetor?
9. What makes more power carb or EFI?
10. Which engine is stronger 2 stroke or 4 stroke?

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22. #course
23. #system