[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: 40CFR86.515-78]

[Page 666-667]
 
                   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. 86.515-78  EPA urban dynamometer driving schedule.

    (a) The dynamometer driving schedules are listed in appendix I. The 
driving schedules are defined by a smooth trace drawn through the 
specified speed vs. time relationships. They consist of a nonrepetitive 
series of idle, acceleration, cruise, and deceleration modes of various 
time sequences and rates. Appropriate driving schedules are as follows:

Class I--Appendix I(c)
Class II--Appendix I(b)
Class III--Appendix I(b)

    (b) The speed tolerance at any given time on the dynamometer driving 
schedule prescribed in appendix I or as printed on a driver's aid chart 
approved by the Administrator, when conducted to meet the requirements 
of Sec. 86.537 is defined by upper and lower limits. The upper limit is 
3.2 km/h (2 mph) higher than the highest point on the trace within 1 
second of the given time. The lower limit is 3.2 km/h (2 mph) lower than 
the lowest point on the trace within 1 second of the given time. Speed 
variations greater than the tolerances (such as may occur during gear 
changes) are acceptable provided they occur for less than 2 seconds on 
any occasion. Speeds lower than those prescribed are acceptable provided 
the vehicle is operated at maximum available power during such 
occurrences. When conducted to meet the requirements of Sec. 86.532 the 
speed tolerance shall be as specified above, except that the upper and 
lower limits shall be 6.4 km/h (4 mph).
    (c) Figure F78-4 shows the range of acceptable speed tolerances for 
typical points. Figure F78-4(a) is typical of portions of the speed 
curve which are increasing or decreasing throughout the two second time 
interval. Figure F78-4(b) is typical of portions of the speed curve 
which include a maximum or minimum value.

[[Page 667]]

[GRAPHIC] [TIFF OMITTED] TR06OC93.177

    (d) For motorcycles with an engine displacement less than 50 cc and 
a top speed less than 58.7 km/hr (36.5 mph), the speed indicated for 
each second of operation on the applicable Class I driving trace (speed 
versus time sequence) in appendix I(c) shall be adjusted downward by the 
ratio of actual top speed to specified maximum test speed. Calculate the 
ratio with three significant figures by dividing the top speed of the 
motorcycle in km/hr by 58.7. For example, for a motorcycle with a top 
speed of 48.3 km/hr (30 mph), the ratio would be 48.3/58.7 = 0.823. The 
top speed to be used under this section shall be indicated in the 
manufacturer's application for certification, and shall be the highest 
sustainable speed of the motorcycle with an 80 kg rider on a flat paved 
surface. If the motorcycle is equipped with a permanent speed governor 
that is unlikely to be removed in actual use, measure the top speed in 
the governed configuration; otherwise measure the top speed in the 
ungoverned configuration.

[42 FR 1137, Jan. 5, 1977, as amended at 69 FR 2441, Jan. 15, 2004]