Small Off-Road Engine or Equipment Regulatory and Certification Documents

This page last reviewed June 2, 2009

This page provides a list of the Manufacturers Advisory Correspondence (MACs), mailouts, correspondence, regulation, test procedures, and guidelines applicable to Small Off-Road Engines or Equipment less than or equal to 19 kilowatts (25 horsepower), and is primarily for the interest and needs of manufacturers and others that are required to obtain certification from ARB. In addition, the engine certification database and Executive Orders can be accessed on-line by clicking on the link provided below. This page also contains a link to the component Executive Order list, which may be used for evaporative certification. For more public-oriented materials, please visit our Small Off-Road Engines or Equipment main program page.

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Regulation and Test Procedures Guidelines
SORE FAQs New button Presentations
Manufacturers Advisory Correspondence Engine Certification Database
Mobile Source Mailouts  Component Executive Orders
Correspondence


Regulation and Test Procedures:
Regulation

Final Exhaust Emission Regulation Order: (MSW97 - 254K) or (PDF - 183K)

Final Evaporative Emission Regulation Order: (MSW97 - 312K) or (PDF - 114K)

  • To view a description of preempt equipment, please click here.
Test Procedures

California Exhaust Emission Standards and Test Procedures for 1995-2004 and Later Small Off-Road Engines (WP6 - 1,378K) or (PDF - 536K)

Amendments to the California Exhaust Emission Standards and Test Procedures for 1995-2004 Small Off-Road Engines (MSW97 - 42K) or (PDF - 18K)

California Exhaust Emission Standards and Test Procedures for 2005 and Later Small Off-Road Engines (MSW97 - 176K) or (PDF - 76K)

Evaporative Emission Test Procedures

  • TP - 901 ~ Test Procedure for Determining Permeation Emissions from Small Off-Road Engine Equipment Fuel Tanks (MSW97 - 203K) or (PDF - 51K)
  • TP-902 ~ Test Procedure for Determining Diurnal Evaporative Emissions from Small Off-Road Engines (MSW97 - 326K) or (PDF - 60K)

Alternative Evaporative Emission Test Procedures

  • Alternative TP - 901 ~ Alternative Test Procedure for Determining Permeation Emissions from Small Off-Road Engine Equipment Fuel Tanks (PDF - 50K)
  • Honda Alternative TP - 901 ~ Honda Alternative Test Procedure for Determining Permeation Emissions from Small Off-Road Engine Equipment Fuel Tanks (PDF - 58K)
  • Honda Alternative TP - 902 ~ Honda Alternative Test Procedure for Determining Diurnal Evaporative Emissions from Small Off-Road Engines (PDF - 101K)

SORE Fact Sheet and FAQS:  New button
  SORE Evaporative Certification FAQ's (Word97 - 214K) or (PDF - 51K) (updated September 23, 2008)
SORE Fact Sheet (PDF - 32K)

Manufacturers Advisory Correspondence:
MAC # Subject
MAC 05-05 Evaporative Emission Requirements for Vehicles with On-Board Generators (PDF - 80K)
MAC 01-01 Optional Use of the Federal Engine Test Cycle Speed and Load Specifications for Exhaust Emission Testing of Spark-Ignition Small Off-Road Engines
MAC 95-08 Optional Application Format for Certification of Carryover Utility and Lawn and Garden Equipment Engine (ULGE) Engine Families for 1996 and Subsequent Years (PDF - 607K)
MAC 95-02 Utility and Lawn and Garden Equipment Engine (ULGE) Streamlined Certification Procedures (PDF - 607K)
MAC 94-05 Emission Control Part Identification for Utility and Lawn and Garden Equipment Engines (ULGEs) (PDF - 271K)
MAC 92-06 Small-Engine Certification Procedures (PDF - 607K)

Mobile Source Mailouts: 
Mailout # Subject
MSO 07-03 New Requirement to Report Carbon Dioxide Emissions from 2008 and Subsequent Model Year California Certified Vehicles and Engines
(PDF - 85K)
MSO 05-05 Public Workshop to Present New Procedures and Requirements for Submitting Mobile Source Emissions Certification Support Documents Electronically (PDF - 84K)
MSO 00-14

Format for Manufacturer Certification and Production Emission Reduction Credit Program for New Engine End-of-Year and Final Reports
(Word97 - 51K) or (PDF - 28K)

MSO 99-08 Certification of 2000 Model Year (MY) and Later Small Off-Road Engines (SORES) (WP6 - 149K) or (PDF - 59K), and Attachment B (Excel 97 - 22K) or (PDF - 6K)
MSO 99-07

Format for Production Line Testing Quarterly Reports for 2000 Model Year and Later Small Off-Road Engine Families (WP6 - 38K) or (PDF - 14K)

The corresponding templates for the four ARB-specified file formats and the Access hard copy formats, referenced in MSO 99-07, are listed below:

MSO 96-30 Tamper-Resistance Requirements for Gaseous-Fueled Engines
(PDF - 9248K)
MSO 95-45 Clarification of Certification Requirements for Utility and Lawn and Garden Equipment Engines (ULGEs) as Detailed in Air Resources Board Mail-out 95-30 (PDF - 314K)
MSO 95-30 Clarification of Certification Procedures for Utility and Lawn and Garden Equipment Engines (ULGEs) (PDF - 733K)

Correspondence:
  ARB April 13, 2005 Response Letter to Outdoor Power Equipment Institute (OPEI) request for enforcement relief (PDF - 1.6M)
Reference No. NSC-2004-025 OPEI's July 1, 2004 Letter to the Air Resources Board (ARB) on Certification of 2005 Model-Year Handheld Lawn and Garden Products (PDF - 71K)
Reference No. C-2000-343 Air Resources Board (ARB) June 5, 2000 Letter to Portable Power Equipment Manufacturers Association (PPEMA) on Alternative Duty Cycles for the Certification of Small Off-Road Engines (SOREs) Below 65 cubic centimeters (cc) in Displacement (PDF - 360K)

PPEMA March 8, 2000 Letter to ARB on Alternative Duty Cycles for SOREs Below 65 cc in Displacement
(PDF - 185K)
Reference No. C-99-313 Air Resources Board (ARB) May 10, 1999 Letter to Engine Manufacturers Association (EMA) on Deterioration Factor (DF) Test Procedure (PDF - 223K)

EMA April 26, 1999 Letter to ARB on EMA Proposal for an Acceptable DF Test Procedure
(PDF - 836K)

Guidelines:
  Development of Deterioration Factors for Small Off-Road Engines (Word 97 - 37K) or (PDF - 50K)
  Engine Sampling Plan Requirements (Word 97 - 27K) or (PDF - 61K) (updated November 15, 2002)
  Procedures for Utilization of Auxiliary Engine Cooling (Word 97 - 22K) or (PDF - 47K)
 

Evaporative Emission Certification Procedures

 

Guidelines for Evaporative Certification of 2006 and Later Small Off-Road Engine/Equipment (MSW97 - 692K) or (PDF - 284K) (updated January 10, 2007)


Presentations:
  SORE/HMC/OHRV Certification and Compliance Workshop Presentation (from February 20, 2008)


Engine Certification Database:

The following link provides the certification database and the Executive Orders for Spark-Ignition Small Off-Road Engines.

Off-Road Certification Database


Component Executive Orders:

The following link provides the component Executive Orders for evaporative certification of Spark-Ignition Small Off-Road Engines or Equipment.

Component Executive Orders


For more information on Small Spark-Ignition Off-Road Engine or Equipment certification procedures, please contact:

Exhaust
- Joseph Jegede at (626) 575-6674 or via e-mail at jjegede@arb.ca.gov

Evaporative - Sophia Mahmood at (626) 350-6435 or via e-mail at smahmood@arb.ca.gov


Small Off-Road Engines and Equipment Top Page
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