[Code of Federal Regulations]
[Title 40, Volume 17]
[Revised as of July 1, 2004]
From the U.S. Government Printing Office via GPO Access
[CITE: 40CFR86.527-90]

[Page 680-681]
 
                   TITLE 40--PROTECTION OF ENVIRONMENT
 
         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
 
PART 86_CONTROL OF EMISSIONS FROM NEW AND IN-USE HIGHWAY VEHICLES AND 
ENGINES--Table of Contents
 
Subpart F_Emission Regulations for 1978 and Later New Motorcycles; Test 
                               Procedures
 
Sec. 86.527-90  Test procedures, overview.

    (a) The procedures described in this and subsequent sections are 
used to determine the conformity of motorcycles with the standards set 
forth in subpart E of this part.

[[Page 681]]

    (b) The overall test consists of prescribed sequences of fueling, 
parking, and operating conditions.
    (c) The exhaust emission test is designed to determine hydrocarbon 
(gasoline-fueled, natural gas-fueled and liquefied petroleum gas-fueled 
motorcycles), methanol, formaldehyde, and hydrocarbon (methanol-fueled 
motorcycles), carbon monoxide and oxides of nitrogen mass emissions 
while simulating an average trip in an urban area. The test consists of 
engine startups and motorcycle operation on a chassis dynamometer, 
through a specified driving schedule. A proportional part of the diluted 
exhaust emissions is collected continuously for subsequent analysis, 
using a constant volume (variable dilution) sampler.
    (d) Except in cases of component malfunction or failure, all 
emission control systems installed on or incorporated in a new 
motorcycle shall be functioning during all procedures in this subpart. 
Maintenance to correct component malfunction or failure shall be 
authorized in accordance with subpart E of this part.
    (e) Background concentrations are measured for all species for which 
emissions measurements are made. For exhaust testing, this requires 
sampling and analysis of the dilution air. (When testing methanol-fueled 
motorcycles, manufacturers may choose not to measure background 
concentrations of methanol and/or formaldehyde, and then assume that the 
concentrations are zero during calculations.)

[54 FR 14551, Apr. 11, 1989, as amended at 59 FR 48515, Sept. 21, 1994; 
60 FR 34357, June 30, 1995]