On-Road Motorcycle Regulation

This page last reviewed June 28, 2016

Image of Motorcycles


ARB adminsters a program for reducing emissions from highway motorcycles.  Authority for controlling emissions from highway motorcycles is established in sections 1958 (exhaust) and 1976 (evaporative), title 13, California Code of Regulations (CCR). The California exhaust emission test procedures are adopted from the U. S. Environmental Protection Agency's (U.S. EPA's) exhaust test procedures in title 40, Code of Federal Regulations, Part 86, subparts E and F.

Requirements for highway motorcycle certification include provisions from demonstrating compliance with the applicable emission standards using specific test procedures, as well as emission labeling and warranty obiligations.

What's New...

A public workshop to discuss a draft proposal to regulate evaporative emissions from Off-Highway Recreational Vehicles (OHRVs) and On-road Motorcycles will be held on April 20, 2010 in El Monte.  The workshop documents can be found here: Workshop Notice,   AgendaProposed Regulation Summary,  Proposed Test Procedures Summary  ARB Presentation

A public workshop discussing future evaporative control measures for on-road motorcycles was held on January 15, 2009 in El Monte.  The presentation can be viewed here:  On-road Test Plan Presentation.

In January 2009, ARB proposed regulatory amendments involving highway motorcycle aftermarket critical emission control parts.

Current Regulations and Test Procedures

2006 Technical Review

A 2006 Review of the 1998 Amendments to the California On-Road Motorcycle Regulations assessed the progress made by manufacturers to meet 2004 and 2008 on-road motorcycle emission requirements.


1998 Amendments

ARB identified highway motorcycles as a potential source of air pollution which could be reduced cost-effectively in order to satisfy requirements of the 1994 California State Implementation Plan (SIP). The SIP required reductions in air pollution from a wide variety of mobile, stationary, and area-wide sources.