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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.
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. If you
subscribe to the ms-mailings list serve, you may wish to delete your subscription to the hard copy lists by notifying
Alex Axt.
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.
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| 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)
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SORE Fact Sheet and FAQS: 
Manufacturers Advisory Correspondence:
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)
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| 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:
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| 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:
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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:
Presentations:
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SORE/HMC/OHRV Certification and Compliance Workshop Presentation
(from February 20, 2008)
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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
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