---
kind: "section"
citation: "40 C.F.R. § 205.155"
title: "40"
number: "205.155"
heading: "Motorcycle class and manufacturer abbreviation."
url: "https://uscodex.org/cfr/40/205.155"
---

# §205.155. Motorcycle class and manufacturer abbreviation.

- (a) Motorcycles must be grouped into classes determined by separate combinations of the following parameters:
  - (1) **Engine type—**
    - (i) **Gasoline—** two stroke.
    - (ii) **Gasoline—** four stroke.
    - (iii) **Gasoline—** rotary.
    - (iv) **Other.**
  - (2) **Engine displacement.**
  - (3) **Engine configuration—**
    - (i) **Number of cylinders.**
    - (ii) Cylinder arrangement (i.e., in line, opposed, etc.).
  - (4) **Exhaust system—**
    - (i) **Muffler—**
      - (A) **Type, (B) Location, (C) Number.**
    - (ii) **Expansion chambers—**
      - (A) **Location, (B) Size.**
    - (iii) **Spark arrestors.**
    - (iv) **Other exhaust system components.**

## Notes

### Source

Source: 45 FR 86708, Dec. 31, 1980, unless otherwise noted.

### Authority

Authority: Secs. 6, 10, 11, 13, Pub. L. 92-574, 86 Stat. 1234 (42 U.S.C. 4905, 4909, 4910, 4912).

### Source

Source: 41 FR 15544, Apr. 13, 1976, unless otherwise noted.