# 40 C.F.R. § 1054.650 (2026): What special provisions apply for adding or changing governors?

> Federal · Regulations · In force

URL: https://www.frixlaw.com/law-library/statutes/CFR_T40_P1054_S1054_650

## Section

- **Citation:** 40 C.F.R. § 1054.650 (2026)
- **Heading:** What special provisions apply for adding or changing governors?
- **Jurisdiction:** Federal
- **Kind:** Regulations
- **Status:** In force
- **Text as of:** August 14, 2026
- **Source:** Compiled text
- **Location:** Title 40 CFR: Protection of Environment / Chapter I / Part 1054 / Subpart G / § 1054.650: § 1054.650   What special provisions apply for adding or changing governors?

## Text

The special provisions in this section apply for engines that will not be governed to control engine speeds consistent with the constant-speed operation reflected by the duty cycles specified in § 1054.505. We refer to these as constant-speed governors in this section. Paragraph (a) of this section also applies for any engines shipped without installed governors. (a) The representative-testing requirements of 40 CFR 1065.10(c)(1) related to in-use duty cycles do not apply to engines you produce and ship without constant-speed governors if you comply with all the following requirements: (1) You must have test data showing that the effectiveness of the engine's emission controls over the expected range of in-use operation will be similar to that measured over the specified duty cycle. Alternatively, if your emission controls depend on maintaining a consistent air-fuel ratio, you may demonstrate that the engine is calibrated to maintain a consistent air-fuel ratio over the expected range of in-use operation. (2) Describe in your application for certification the data and analysis that supports your conclusion. (b) It is a violation of the tampering provisions in 40 CFR 1068.101(b)(1) to remove a governor from a certified engine unless you recertify the engine in the modified configuration.

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Source: Frix Law Library, https://www.frixlaw.com/law-library/statutes/CFR_T40_P1054_S1054_650. Check the current official text before relying on it. Not legal advice.