Small Off-Road Engine or Equipment Regulatory and Certification Documents

This page last reviewed May 20, 2011

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.

Please sign up to the new Mobile Source Mailouts and MAC list server. By doing this, you will be notified when a new Mobile Source Mailout or MAC has been posted to the Mobile Source Mailouts or MAC webpages. These email notices can replace any of the mobile source hard copy mailing lists you may already be on.

Regulation and Test Procedures	Guidelines
SORE Fact Sheet and FAQs	Presentations
Manufacturers Advisory Correspondence	Engine Certification Database
Component Certification Status	Component Executive Orders
Correspondence	Mobile Source Mailouts
Document Management System (DMS)

Regulation and Test Procedures:

Regulation

Exhaust Emission Regulation Order: (PDF - 183K) (adopted July 26, 2004)

Amendments to the Exhaust Emission Regulations - Sections 2401, 2403-2406, 2408, 2409 and Adopted Section 2408.1 (PDF - 110K) (adopted February 24, 2010, and corrected March 29, 2010)

Final Evaporative Emission Regulation Order: (PDF - 114K) (adopted July 26, 2004)

View a description of preempt equipment.

Test Procedures

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

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

California Exhaust Emission Standards and Test Procedures for 2005 and Later Small Off-Road Engines (PDF - 76K) (adopted July 26, 2004)

Amendments to the California Exhaust Emission Standards and Test Procedures for 2005 and Later Small Off-Road Engines (PDF - 12K) (amended February 24, 2010)

Evaporative Emission Test Procedures

TP - 901 ~ Test Procedure for Determining Permeation Emissions from Small Off-Road Engine Equipment Fuel Tanks (PDF - 51K)
TP-902 ~ Test Procedure for Determining Diurnal Evaporative Emissions from Small Off-Road Engines (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:

	SORE Evaporative Certification FAQ's (PDF - 71K) (updated February 1, 2011)
	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 96-06	Modified Test Procedures for Integrated Generator Sets (Gensets) (PDF - 341K)
MAC 95-02	Utility and Lawn and Garden Equipment Engine (ULGE) Streamlined Certification Procedures (PDF - 607K)
MAC 94-08	Certification of One-Wheeled Lawn Edger Equipment Engines (PDF - 755K)
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 (PDF - 28K) For Model Year 2006 and Earlier Excel Templates (Excel97 - 18K) Access Template (Access97 - 260K) Attachment 1 (PDF - 12K) Attachments 2, 3, 5, 6, 8, 9 (PDF - 32K) Attachments 4 and 7 (Access97 - 356K) For Model Year 2007 and Later (updated March 28, 2008) Excel Templates (Excel97 - 17K) Access Template (Access97 - 132K) Attachment 1 (PDF - 10K) Attachments 2, 3, 5, 6, 8, 9 (PDF - 50K) Attachments 4 and 7 (Access97 - 186K)
MSO 99-08	Certification of 2000 Model Year (MY) and Later Small Off-Road Engines (SORES) (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 (PDF - 14K) Attachment 1 - Overview of attachments and database structure (PDF - 13K) Attachments 2 through 10, not 6 (Excel 97 - 86K) or Attachments 2 and 3 (PDF - 12K) and Attachment 4 (PDF - 5K) and Attachments 5, 7-10 (PDF - 22K) Attachment 6 (Access 97 - 84K) or (PDF - 16K) The corresponding templates for the four ARB-specified file formats and the Access hard copy formats, referenced in MSO 99-07, are listed below: Engine Family Information File (Excel - 15K) Engine Family Data Per Quarter File (Excel - 15K) Individual Engine Test Data Per Quarter (Excel - 15K) Combined Quarters Engine Family File (Excel - 14K) Small Off-Road Engine (Access Database - 420K) (updated April 20, 2006)
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 (PDF - 50K)
	Engine Sampling Plan Requirements (PDF - 61K) (updated November 15, 2002)
	Procedures for Utilization of Auxiliary Engine Cooling (PDF - 47K)
	Evaporative Emission Certification Procedures CP - 901 ~ Certification And Approval Procedures for Small Off-Road Engine Fuel Tanks (PDF - 43K) CP - 902 ~ Certification And Approval Procedures for Evaporative Emission Control Systems (PDF - 139K)
	Guidelines for Evaporative Certification of 2006 and Later Small Off-Road Engine/Equipment (PDF - 284K) (updated January 10, 2007) Evaporative Certification Form for < 80 cc (PDF - 109K) Evaporative Certification Form for > 80 cc (PDF - 131K)

Presentations:

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

Original Presentation (PDF - 6131K)
Expanded SORE-only Presentation (PDF - 2785K)

Engine Certification Database:

View the Certification Database and the Executive Orders for Spark-Ignition Small Off-Road Engines.

Component Certification Status:

Coming soon! View the status for certification of Spark-Ignition Small Off-Road Engines or Equipment.

Component Executive Orders:

View the Component Executive Orders for evaporative certification of Spark-Ignition Small Off-Road Engines or Equipment.

Document Management System (DMS):

View the guidelines regarding the electronic Document Management System used to submit certification applications and supporting documents:

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

Exhaust - Joseph Jegede at (626) 575-6674.

Evaporative - Sophia Mahmood at (626) 350-6435.