- 1 - ICS 43.140  
T 80 
 
 
 
 
National Standard  
of the People's Republic of China  
 
 
GB15744  - 200X  
 Replaces GB 15744 -1995, GB/T 16486 -1996  
 
 
The limits and measurement methods  
of fuel consumption for motorcycles  
 
(IS07860: 1995 Motorcycles - Methods of measurin g fuel consumption, NEQ)  
 
 
  
Draft for approval  
 
 
 Issue Date: 200X – XX – XX Implementation Date: 200X – XX – XX 
 
 
 
Issued by the General Administration of Quality Supervision, Inspection and 
Quarantine of the People's Republic of China  
 
 
 
 
 
- 2 - Table of  Contents
Foreword ................................ ................................ ................................ ................................ 3 
1  Scope ................................ ................................ ................................ ................................ ........... 5 
2  Normative references ................................ ................................ ................................ ................... 5 
3  Terms and definitions ................................ ................................ ................................ ................... 5 
4  Test types and test conditions ................................ ................................ ................................ ....... 5 
5  Test prepara tions ................................ ................................ ................................ .......................... 6 
6  Type I Test (measurement of the average fuel consumption under the condition of the prescribed 
operating cycle) ................................ ................................ ................................ ............................... 7 
7  Type II test (measurement of the average fuel consumption at a constant speed) .......................... 9 
8  Limits and calculation methods of fuel consu mption ................................ ................................ ..11 
Appendix A Motorcycle Product Description ................................ ................................ ........ 15 
Appendix B  Measuring Device for Motorcycle Fuel Consumption ................................ ....... 17- 3 -  
Foreword  
The Appendices to this Standard are recommended, whilst the rest is mandatory.  
 
The consistency degree of this Standard a nd the second edition of ISO7860, “Motorcycles – 
Methods of measuring fuel consumption” (English version) implemented by the International 
Standards Organization (ISO) on 15 December 1995 is non -equivalent.  
 
In comparison with the abovementioned Standard I SO7860, the main revised content of this 
Standard are as follows : 
− the international standards referenced in the original Standard have been changed in this 
Standard to references of the corresponding national Standards;  
− the contents of operating cycles in the original Standard have been withdrawn and changed to 
directly use the operating cycles in GB14622 -2002;  
−  the order of the numbering of certain clauses and articles has been readjusted;  
−  fuel consumption limits have been added;  
− certain contents of Appe ndix A have been condensed.  
 
This Standard replaces the motorcycle -related content of GB/T15744 -1995, “ Motorcycles and 
mopeds – Limits of fuel consumption”, and GB/T16486 -1996, “Motorcycles and mopeds - 
Measurement methods of fuel consumption”. In compari son to GB/T15744 -1995 and GB/T16486 -
1996, the main changes to this Standard are:  
− the division of fuel consumption limits is carried out on the basis of discharge capacity, and is 
distinguished from the division range of the original Standard, the division methods carried out 
on the basis of strokes has been withdrawn;  
− fuel consumption limits include both Type I test and Type II test contents;  
− measuring points of Running Mode Method on measuring fuel consumption has been added, 
and the vehicle speed determin ation method specified in the Constant Speed Metering Method 
has been changed;  
− the number of tests in the Constant Speed Metering Method and the method for calculating test 
results have been altered.  
 
Appendix A and Appendix B to this Standard are normativ e annexes.  
 
This Standard is proposed by China National Development and Reform Commission.  
 
This Standard is under the jurisdiction of the National Automobile Standardisation Technical 
Committee.  
 
The organisations that participated in the drafting of thi s Standard are:  
Tianjin Motorcycle Technical Centre;  
Shanghai Motorcycle Research Institute;  
Zhejiang Qianjiang Motorcycle Co., Ltd.  
 
The main drafters of this Standard are:  He Wenjie, Wang Qing, Liu Xin, Ma Xiaoqiang, Quan 
Yifeng, Guo Zexin, Lin Xianjin , Sun Weimin.  
 
This Standard replaces the previously issued Standards:  
− GB 5377 -85; - 4 - − GB/T 15744 -1995;  
− GB/T 16486 -1996.  
 
This Standard shall be implemented six months after its issue date; the checking for conformity of 
production shall be carried out 18 mont hs after its issue date.  
 - 5 -            
Limits and measurement methods  
of fuel consumption for motorcycles  
 
1 Scope  
This Standard specifies the limits and measurement methods of fuel consumption for motorcycles.  
This Standard applies to motorcycles (excluding  racing motorcycles and cross -country 
motorcycles).  
2 Normative References  
The provisions of the following documents become provisions of this Standard after being 
referenced. For dated reference documents, all later amendments (excluding corrigenda) and 
versions do not apply to this Standard; however, the parties to the agreement are encouraged to 
study whether the latest versions of these documents are applicable. For undated reference 
documents, the latest versions apply to this Standard.  
 
GB/T 1884, Crud e petroleum and liquid petroleum products – Laboratory determination of density 
– Hydrometer method (GB/T 1884 -2000, ISO 3675:1998, EQV);  
 
GB/T 5378 -1994, General rules of running test for motorcycles and mopeds;  
 
GB/T 5384 -1996, Measurement method for the  maximum speed of motorcycles and mopeds;  
 
GB14622 -2002, Limits and measurement methods for exhaust emissions from motorcycles under 
running mode.  
3 Terms and definitions  
The terms and definitions mentioned below and the terms and definitions set out in GB/ T 14622 -
2002 apply to this Standard.  
 
3.1 Reference speed  
The driving speed when carrying out fuel consumption measurement tests (Type II test) for 
motorcycles.  
4 Test types and test conditions  
4.1 Test types  
Motorcycles shall be subject to two types of tes t. 
4.1.1 Type I test (measurement of the average fuel consumption under the condition of 
prescribed operating cycle)  
Type I test is completed on a chassis dynamometer; the test uses operating cycles set out in 
section C.2 of Appendix C to GB 14622 -2002. Ea ch test includes two continuous operating 
cycles.  
4.1.2 Type II test (measurement of the average fuel consumption at constant speed)  
Type II test is completed on a road or on a chassis dynamometer, so as to measure the fuel 
consumption of the test -vehicle when the test -vehicle is driving at a reference speed.  - 6 - 4.2 Environmental conditions  
The test environment should meet the following conditions:  
- Relative humidity: less than 95%;  
- Maximum wind velocity: below 3m/s;  
- Maximum velocity of gusts: below 5m/s;  
- Environment temperature: 278k ~ 303k.  
4.3 Standard conditions  
Standard conditions as follows:  
- Atmospheric pressure: p0=100kpa;  
- Atmospheric temperature: T0=293K;  
- Relative air density: d0=0.9197;  
The relative air density during the test should be de termined by means of formula (1), when 
compared to the air density under the standard state the differential value should not be greater 
than 7.5%.  
TT
TTT
PPd d0
00××=  (1) 
Where:  
dT – the relative air density under test condition;  
PT – the atmospheric pressure when testing - unit is kPa (kPa);  
TT – the atmospheric temperature when testing - unit is Kelvin (K);  
5 Test preparations  
5.1 Test -vehicle  
5.1.1  The manufacturer of the motorcycle or its authorised agent should submit information for 
product description in accordance with Appendix A.  
5.1.2  Before the test, the test -vehicle should carry out running -in in accordance with the 
requirements set out in the manufacturer's technical documentation, and should be in normal 
operating mode.  
5.1.3  Check the air -tightness of the air intake system and fuel supply system so as to ensure the 
mixed air is not effected by unexpected air intake.  
5.1.4  The adjustment of the test -vehicle should be carried out in accordance with the 
requirements set out in the  technical documentation. The pressure of the tyres should conform to 
the requirements set out in the technical documentation.  
5.1.5  The test -vehicle should be examined before the test; the test -vehicle should be consistent 
with the description in the manu facturer's technical documentation; the test -vehicle should be 
able to be driven normally and started normally, either cold or warmed up.  
5.1.6 Before the test, in order to achieve the normal state specified in the manufacturer's 
technical documentation, t he test -vehicle should undergo a pre -driving warm -up. If no 
requirements are specified, the test -vehicle should undergo pre -driving warm -up for four - 7 - operating cycles in accordance with the operating cycle requirements set out in section C.2 of 
Appendix C t o GB 14622 -2002; if the test is carried out on a road, in order for the engine and 
driving system to achieve normal heat conditions, the test -vehicle should first be driven for at 
least 15 minutes under normal driving conditions.  
5.1.7  When testing, the lo ad mass of the vehicle and the passenger combined should meet the 
requirements set out in the manufacturer's technical documentation. If no special requirements 
are provided, the specific mass for a two -wheeled motorcycle should be the mass of one driver. 
The specific mass for a motorcycle and side -car should be the total mass of one driver and two 
passengers. Ballast is permitted to replace passengers, but the positioning of the ballast should 
be near the riding position of the passengers. The mass of each  passenger is considered to be 
75kg. The specific mass for a three -wheeled motorcycle is the maximum factory -set load mass 
specified in the technical documentation for the given vehicle. The mass of the fuel 
consumption measuring device should be obtained,  and each mass mentioned above should be 
recorded in the test record.  
5.1.8  The load distribution between the front -wheel axle and back -wheel axle should conform to 
the requirements specified in the manufacturer's technical documentation. When installing a  
measuring instrument on the test vehicle, the effect to the original load distribution should be 
reduced to a minimum.  
5.1.9  When installing a fuel consumption measuring device and speed sensor on the sides of the 
motorcycle, additional air resistance sho uld be minimised as much as possible.  
5.2 Fuels and lubrication oil  
The fuels specified in GB 14622 -2002 should be used during the test. The density of the test 
fuel should be determined in accordance with the method set out in GB/T 1884; the ratio of the 
carbon -hydrogen should use a fixed value, and gasoline is 1.85.  
The distribution of engine lubrication oil should conform to the required grades and quantities 
specified in the manufacturer's technical documentation.  
6 Type I Test  (measurement of the avera ge fuel consumption under the condition of the 
prescribed operating cycle)  
6.1 The operating cycle on the chassis dynamometer  
The setting of the operating cycles of the motorcycle should conform to the requirements set out 
in section C.2, Appendix C to GB 14622 -2002.  
6.2 Test equipment  
6.2.1 Chassis dynamometer  
The main characteristics of the chassis dynamometer should conform to the requirements set out 
in section C.4.1, Appendix C to GB 14622 -2002.  
When measuring fuel consumption, the measurement system u sed for fuel consumption, travel 
distance and time should be kept simultaneously.  
6.2.2 Measurement methods and measurement equipment of fuel consumption  
The measurement of fuel consumption should be carried out in accordance with one of the 
following meth ods; the selection of the measurement method depends on the characteristic of 
each method and test type (Type I test or Type II test):  
a) flow measurement method;  - 8 - b) volume measurement method;  
c) weight measurement method;  
      d)  carbon balance measurement metho d (only applies to motorcycles with a four -stroke 
engine installed).  
For the interpretation of the measurement methods, see section B.1 of Appendix B. Other 
measurement methods are permitted if the test results can be proved to be the same.  
6.2.2.1 In sect ion B.2 of Appendix B, the installation requirements and operating instruction for 
the fuel consumption measuring device are specified. The fuel should be supplied to the engine 
after having gone through a device for measuring fuel -rate that is consistent with Appendix B, 
with an accuracy of ± 2%, and this device should ensure that the performance of the engine is 
not affected. When using volume measurement system, the fuel temperature inside the device or 
the fuel temperature of the device outlet should be  measured.  
A normal fuel supply system switch over to a measurement system should be achieved by a 
valve system, and its switch over time should not be greater than 0.2s.  
6.2.2.2  When using the carbon balance method to take measurements, the test equipment  should 
be the same as the equipment required in GB 14622 -2002.  
6.3 Measurement procedures  
6.3.1  The readjustment of the chassis dynamometer should conform to sections C.5.1 and C.5.2 
of Appendix C to GB 14622 -2002.  
6.3.2  Measurements should be carried out  in accordance with the procedures set out in section 
C.6 of Appendix C to GB 14622 -2002. The operating procedures of the measuring device for 
fuel consumption should conform to Appendix B. When using the carbon balance method to 
carry out exhaust gas samp ling, analysis and volume measurement, the procedures should be 
performed in accordance with the requirements set out in C.7 of Appendix C, GB 14622 -2002.  
6.4 Measurement of fuel consumption  
The fuel consumption value from every second continuous operating  cycle is regarded as one 
measured value.  
6.5 Determination of measurement results  
6.5.1 Measure the fuel consumption continuously three times as specified in 6.4, and take the 
calculated average value of the three measured values as the final measurement result. Allow no 
longer than 60s idling speed between every second measurement; during the idling speed 
period, do not take any fuel consumption measurements.  
6.5.2  If the maximum differential value between the measured values does not exceed 5% of the 
arithmetic average value, then this measurement result is valid; otherwise, re -take the 
measurement until the value A, which is determined by means of the formula in 6.5.3, does not 
exceed 5%.  
6.5.3  A value is determined by means of formula (2):  
FCnsKA100××=  (2) 
 
Where: K can be found in Table 1  
 - 9 - Table 1 k Value Table  
n 4 5 6 7 8 9 10 
k 3.2 2.8 2.6 2.5 2.4 2.3 2.3 
k
 n 1.6 1.25 1.06 0.94 0.85 0.77 0.73 
 
n - number of tests;  
s - standard deviation, c an be determined by means of formula (3):  
( )
11
−−
=∑
=
nFC FC
sn
ii   (3) 
      Where:  
      FC i - fuel consumption at the i-th time measurement, unit is litre per 100 km (L/100km);  
      FC - is the arithmetic  average value of the n FC values, unit is litre per 100km (L/100km).  
6.5.4  If, after 10 tests, the value A is still greater than 5%, change to another vehicle of the same 
model to carry out measurements.  
6.5.5  The calculated result for the fuel consumptio n should be rounded off to two decimal 
places.  
7 Type II test (measurement of the average fuel consumption at a constant speed)  
7.1 Test conditions  
7.1.1  Type II test should be carried out on road or on the chassis dynamometer.  
7.1.2  See to 6.2.2.1 for the installation requirements and operating instructions for the 
measuring device of the fuel consumption.  
7.2 Measurement methods on road  
7.2.1 The driver and driving posture  
7.2.1.1  The driver should wear protective clothing and a helmet; the height of the driver should 
be 1.75m ± 0.05m; the body weight of the driver should be 75kg ± 5kg.  
7.2.1.2 Driving posture  
When driving, the driver should be sitting on the designated seat, both hands controlling the 
steering handle, both feet on the foot support, both arms stretched out normally. During the 
measurement process, the driver should keep the same driving posture.  
7.2.2 Test road  
7.2.2.1 The test road should be an enclosed ring road of a length of more than 2000m and a 
minimum turning radius of more than 200 m, or a straight road with a length of over 500m, on 
which the vehicle can be driven in both directions.  
7.2.2.2 The surface of the road should be covered with asphalt, tar, concrete or other equivalent 
materials.  - 10 - 7.2.2.3  The test road should be as level a s possible, the longitudinal slope of the road should not 
be allowed to exceed 1%; the height difference between any two points on the road should not 
be allowed to exceed 1m; the horizontal slope of the road should not be allowed to exceed 3%.  
7.2.2.4  The test-road should be level, dry and free from obstacles.  
7.2.2.5  Test distance: 500m.  
7.3 Measurement methods on chassis dynamometer  
When a test is carried out on the chassis dynamometer, the setting should conform to the 
stipulations of 6.3.1.  
7.4 Test m ethods  
7.4.1 The test should be performed in first gear, according to the reference speed provided in 
Table 2 so as to carry out fuel consumption measurement at a constant speed. The measurement 
for the maximum speed of the motorcycle should conform to the  requirements set out in GB/T 
5384. The best value obtained from the reference speeds of the two tests is regarded as the 
measured result of the Type II test.  
Table 2 Reference Speed  
Maximum Speed  
km/h  Reference Speed  
km/h  
V > 130  120 and 90  
100 < V  130 90 and 60  
70 < V  100 60 and 45  
V  70 45 
 
7.4.2 Measurement of fuel consumption  
7.4.2.1  Measure the fuel consumption under a steady reference speed when carrying out 4 tests, 
in which the average speed of two tests is lower than the reference sp eed, and the average speed 
of other two times is higher than the reference speed. During the test process, the allowable 
difference of driving speed of the test vehicle should be controlled within a range of ± 2km/h.  
The differential value between the aver age speed of each test and the reference speed is less 
than 2km/h.  
The fuel consumption of each test should be determined by means of formula (5) and formula 
(6). 
7.4.2.2  The difference in the fuel consumption between the two tests where the average speed is 
lower than the reference speed should be smaller than 5% of the average value obtained from 
these two tests; the same requirement applies to the two tests where the average speed is higher 
than the reference speed. The fuel consumption measured under th e reference speed should be 
determined by means of linear interpolation.  
7.4.2.3  If none of the pairs of calculated values meet the requirements specified in 7.4.2.2, then 
four more tests should be carried out. If, after ten sets of tests, the abovemention ed requirements 
are still not met, then another motorcycle of the same model should be selected and tests carried 
out in the above order.  - 11 -  
 
Note: X shape marks (four intersection) corresponding to the calculated values of each driving 
test. FC II is the av erage fuel consumption obtained by means of the linear interpolation under 
the reference speed V.  
Diagram 1 Calculation of average fuel consumption under a reference speed  
 
8 Limits and the calculation methods of fuel consumption  
8.1 Calculation of fuel con sumption  
The fuel consumption should be determined by means of the formula (4):  
II I FC FC FC ×+×= 4.0 6.0   (4) 
Where:  
 FC I – for fuel consumption measured from the Type I test, the unit is litre per 100 kilometres 
(L/100km);  
FC II – for fuel consu mption measured from the Type II test, which is obtained by means of the 
linear interpolation under the reference speed, the unit is litre per 100 kilometres (L/100km).  
8.2 Calculation of fuel consumption for Type I test and Type II tests  
8.2.1 If the fuel  consumption value is obtained by using the volume method, then the fuel 
consumption FC should be determined by means of the formula (5):  
() [ ]10010×−+=ST Ta QFCi   (5) 
Where:  
FC I - the fuel consumption at i-th time test, the unit is litre per 10 0 kilometre (L/100km);  
Q - the measured fuel consumption, the unit is litre (L);  
a - the coefficient of fuel volume expansion, gasoline is 0.001K-1; 
- 12 - T0 - standard temperature (293k), unit is kelvin (k);  
T - fuel temperature, unit is kelvin (k);  
S - the set  travel distance per unit volume fuel in vehicle test, unit is kilometre (km).  
8.2.2 If the fuel consumption value is obtained by using the weight method, then the fuel 
consumption FC should be determined by means of the formula (6):  
100×
×=
SmFCir   (6) 
Where:  
FC i - fuel consumption at i-th time test, unit is litre per 100 kilometres (L/100km);  
m - measured value of fuel consumption, unit is kilogram (kg);  
p - fuel density under standard state (293k), unit is kilogram per litre (kg/L);  
S - distance travelled during vehicle test, unit is kilometre (km).  
8.2.3 If the fuel consumption value is obtained using the carbon balance method, then the fuel 
consumption FC is determined by means of the formula (7):  
( )( )( ) [ ]
2273.0 866.0 429.01154.0
CO HC co i M M M FC × + × + × × =
r   (7) 
Where:  
FC I  - fuel consumption at  i-th time test, unit is litre per 100 kilometres (L/100km);  
Mco - emission of carbon monoxide, unit is gram per kilometre (g/km);  
MHC - emission of hydrocarbon, unit is gram per kilometre (g/km);  
Mco2 - emission of  carbon -dioxide, unit is gram per kilometre (g/km);  
p - fuel density under standard state (293k), unit is  kilogram per litre (kg/L);  
8.2.3.1  The emission of gaseous pollutants should be determined by means of the formula (8):  
Sd VMj mix
j610−××=    (8) 
Where:  
Mj - emission of pollutant j, unit is gram per kilometre (g/km);  
Vmix - volume of diluted exhaust gas, which is corrected to standard state (273.2k and 
101.33kPa), unit is litre per test (L/test);  
dj - density of the pollutant  j under standard state (273.2k and 101.33kPa), unit is gram per litre 
(g/L);  
Cj - concentration of the pollutant j in the diluted exhaust gas; carry out correction in accordance 
with the content of pollutant in the diluted air, unit is volume concentration 10-6; if the volume is 
expressed by percentage, then the coefficient 10-6 should be replaced by 10-2. 
S - travel distance during test period, unit is kilometre (km).  
8.2.3.2 Determination of volume  
8.2.3.2.1 When using a dilution device, the constant flow of whic h is controlled by an orifice - 13 - plate or venturi tube to measure the volume, continuously record the parameter which 
demonstrates the volume flow -rate and calculate the total volume during the test.  
8.2.3.2.2  When using a positive displacement pump to calcul ate volume, the volume of diluted 
exhaust gas inside of the positive displacement pump system should be determined by means of 
formula (9):  
N VV ×=0   (9) 
Where:  
V –volume of diluted exhaust gas (before the correction), unit is li tre per test (L/test);  
V0 – gas volume discharged by the positive displacement pump under test conditions, unit is 
litre per revolution (L/r);  
N –number of revolutions in each test, unit is revolution (r).  
8.2.3.2.3  Correct the volume of diluted exhaust ga s to standard state; the correction for volume 
of diluted exhaust gas is determined by means of formula (10):  
pp
mixTPKV V ××=1   (10) 
Where:  
k1 – the coefficient, ( )1
1 6961.233.1012.273−× = = kPaK K   (11) 
Pp –absolute pressure at the inlet of the positive displacement pump, unit is kPa (kPa);  
Tp – average temperature of diluted exhaust gas admitted into the positive displacement pump 
during the test, unit is Kelvin (K).  
8.2.3.3  The corrected concentration of the pollutant inside the sampling  bag should be 
determined by means of formula (12):  


− −=DFC C Cd c j11   (12) 
Where:  
Cj - concentration of the pollutant j in the diluted exhaust gas after the content of the pollutant  j 
in the diluted air is corrected; unit is volume conc entration 10-6 or %;  
Ce – measured concentration of the pollutant j in the diluted exhaust gas, unit is volume 
concentration 10-6 or %;  
Cd – measured concentration of the pollutant j in the diluted air, unit is volume concentration 10-
6 or %;  
DF – dilution  coefficient, determined by means of the formula (13):  
HC CO CO C C CDF+ +=5.05.14
2  (13) 
Where:  
Cco2 –concentration of CO 2 in the diluted exhaust gas which is inside of the sampling bag, unit 
is volume concentration %;  - 14 - Cco - concentration of CO in the diluted exhaust gas which is inside of the sampling bag, unit is 
volume concentration %;  
CHC - concentration of HC in the diluted exhaust gas which is inside of the sampling bag, unit is 
volume concentration %;  
8.2.4 Mixing fuels/lubricants  
For two -stroke motorcycles that use mixed oil as lubrication, remove the consumption of the 
lubricant when making the calculation.  
8.3 See Tables 3 and 4 for the fuel consumption limits for motorcycles.  
Table 3 Fuel consumption limits for two -wheel motorcycles  
Engine  
Displacement  >50 ~ 
100 100 ~ 
125 125 ~ 
250 250 ~ 
400 400 ~ 
650 650 ~ 
1000  1000 ~ 
1250  1250  
Fuel 
Consumption 
Limit 
L/100km  2.3 2.5 2.9 3.4 5.2 6.3 7.2 8.0 
 
Table 4 Fuel consumption limits for three -wheeled motorcycles  
Engine 
Displacement  
ml >50 ~ 
100 100 ~ 150  150 ~ 250  250 ~ 400  400 ~ 650  650  
Fuel 
Consumption 
Limit 
L/100km  3.3 3.8 4.3 5.1 7.8 9.0 
  
 
 
 
 
 
 - 15 - Appendix A  
(Normative Annex)  
Motorcycle Product Description  
A.1 Name of manufacturer (trademark) --------  
A.2 Vehicle type -------------  
A.3 Vehicle mass  
Complete vehicle kerb mass -----kg 
Rated carrying -capacity ------ kg 
A.4 Transmission manual/ automatic gear (speed ratio) number -------  
Gear ratio (manual transmission)  
First gear --------  
Second gear ------  
Third gear -------  
Fourth gear -------  
Fifth gear ---------  
Sixth gear ----------  
A.5 Driving speed ratio  
Primary --------  
Final -----------  
A.6 Tyre:  
Front tyre specification -------- mm; Back tyre specification -------- mm 
Tyre pressure  Specified in technical documentation  Actual  
Front tyre  ------- ------- kPa    ------- kPa 
Back tyre  -------------- kPa    -------- kPa 
A.7 Engine  
Manufacturer ------------  
Type -----------------------  
Cycle 2 -stroke/4 -stroke ------------  
Number of cylinders and arrangement form ----------  
Cylinder bore --------------- mm 
Stroke ------------------- mm 
Displacement -------------- ml 
Compression ratio --------  
Fuel------------  
Cooling system type water/ air/ others (detailed explanation) -----------  - 16 - Air filter type ---------------  
Lubrication system -------  
(two-stroke engine: separate typ e/ mixed type)  
A.8 Appended Pollution Control Device  
(whether is included by other projects) ------ yes/no  
Fuel supply type -----------  
Carburettor /fuel injection system  
Trademark ---------  
Type ---------  
A.9 Engine performance  
Idling speed --------- r/min  
Engi ne maximum power and corresponding speed ----------- kW (r/min)  
 - 17 -  
    Appendix B  
(Informative Annex)  
Measuring Device for Motorcycle Fuel Consumption  
 
B.1 Measurement methods  
B.1.1 Flow measurement method  
The flow measurement method uses a device that enable s the continuous or discontinuous 
measurement of the definite mass or volume of fuel that passes through the device within a 
certain time range.  
When continuously measuring, the device presents a display related to the flow -rate; when 
discontinuously measu ring, the device presents a display set on the basis of measuring the 
minimum elementary volume.  
 
B.1.2 Volume measurement method  
The volume measurement method uses an already known volume -measuring device to measure 
the volume of fuel consumption. This me asuring device should be a “fixed” volume -measuring 
device or a “variable” volume -measuring device.  
A “fixed” volume -measuring device enables only a fixed reading of the fuel flow. This fuel flow 
is already set. This flow depends on its own volume of the m easuring device or the indications 
on the measuring device.  
A “variable” volume -measuring device is an instrument with graduation marks. It enables non -
fixed fuel flows to be read.  
 
B.1.3 Weight measurement method  
The weight measurement method uses a weigh t-measuring device to determine the mass of the 
fuel consumption; the device should be a “fixed” weight measuring device or a “variable” 
weight -measuring device.  
A “fixed” weight -measuring device enables only a fixed reading of the fuel flow. This fuel flo w 
is already set. This flow depends the measuring device itself and its characteristics.  
A “variable” weight -measuring device allows non -fixed fuel flows to be read.  
 
B.2 Installation of the measuring device  
B.2.1 General points for attention  
B.2.1.1  Which ever measurement method is selected, the installation of the measuring device 
shall not interfere with or change the state of the fuel supply from the fuel supply system of the 
vehicle.  
Here, the pressure drop and the dimension of the cross -section of the fuel supply pipeline, and 
the length of the pipeline should be primarily taken into consideration.  - 18 - B.2.1.2 Consider meeting the conditions specified in B.2.1.1.  
a) if the flow measurement method is selected, when the pressure drop of the passing system is 
smaller than 100Pa, then the flow meter should be installed according to Diagrams B.1 and B.2  
b) the installation of the volume measurement method and weight measurement method should 
be performed according to Diagram B.3, Diagram B.4, Diagram B.5 and Diag ram B.6.  
B.2.1.3  If it can be proved that the fuel supply system of the vehicle shall not be affected, then 
other installation methods may be used.  
B.2.1.4 In order to reduce pressure loss, suggest:  
2 1d d≤  (B.1)  
3 2d d=  (B.2)  
Where:  
d1 – diameter of the original fuel pipe, unit is millimetre (mm);  
d2 and d3 – diameters of the fuel pipes of the measurement devices, unit is millimetre (mm)  
 
B.2.2 Flow measurement method  
B.2.2.1 the design of the flowmet er should be carried out on the basis of the pressure drop of the 
passing device is not greater than 100Pa.  
B.2.2.2  Diagram 1 is the schematic diagram for the flow measurement system when the 
carburettor supplies fuel; Diagram 2 is the schematic diagram fo r flow measurement system 
when the fuel is supplied by fuel injection.  
 
B.2.2.3 Accuracy  
During the whole testing period, the accuracy of the overall testing process is within a range of 
± 2%.  
B.2.3 Volume measurement method  
B.2.3.1  Diagram 3 is the schem atic diagram for volume measurement system when the 
carburettor supplies fuel; Diagram 4 is the schematic diagram for volume measurement system 
when the fuel is supplied by fuel injection.  
B.2.3.2 Test conditions (the chassis dynamometer indicated in Diagr am 2 and the volume 
method used on a road)  
B.2.3.2.1  The measuring tube should be installed on one side of the fuel tank according to the 
following method:  
3001+−≤ h h hu a   (B.3)  
The unit of the abovementioned numerical value should be m m. 
B.2.3.2.2  The pressure inside the measuring tube should not be affected by the wind pressure on 
the air outlet of the measuring tube.  
 
 - 19 - B.2.4 Weight measurement method  
B.2.4.1  Diagram 5 is the schematic diagram for the weight measurement system when the  
carburettor supplies fuel; Diagram 6 is the schematic diagram for the weight measurement 
system when the fuel is supplied by fuel injection.  
B.2.4.2  Requirements for graduation marks  
Accuracy:  1% 
Resolution capacity: 0.1g  
B.2.4.3 Density measurement (ma ss/volume)  
Measurement accuracy of 1g/cm3 and change to standard state.  
 
hu – fuel upper limit, mm;     2 – fuel tank outlet;  
hl – fuel lower limit, mm;     d1 – diameter of original fuel pipe, mm;  
p – pressure loss after passing flowmeter, Pa;   d2 – diame ter of measurement device fuel pipe, mm;  
I – carburettor fuel intake;     d3 - diameter of measurement device fuel pipe, mm.  
Diagram B.1 Flow Measurement Method  
(Fuel Measurement System when carburettor supplies fuel)  
 
 Carburettor 
Bowl  - 20 - 
 
hu – fuel upper limit, mm;       1 – levelling instrument fuel inlet;  
hl – fuel lower limit, mm;       2 – fuel tank outlet;    
p – pressure loss after passing flowmeter, Pa;     3 – levelling instrument fuel outlet;  
d1 – diameter of original fuel pipe, mm;      4 - levelling instrument fuel in let;  
d2 – diameter of measurement device fuel pipe, mm;    5 – fuel tank inlet;  
d3 - diameter of measurement device fuel pipe, mm;             6 – levelling instrument air outlet pipe.  
Diagram B.2 Flow Measurement Method  
(Fuel Measurement System when fuel i s supplied by fuel injection,)  
 
 
 
 
 
hu – fuel upper limit, mm;     d4 – diameter of air outlet tube of measuring tube, mm;  
hl – fuel lower limit, mm;      1 – carburettor fuel intake;    
ha – maximum measuring height of the measuring tube, m;  2 – fuel tank outlet;    
d1 – diameter of original fuel pipe, mm;     3 – air outlet of measuring tube;  
d2 – diameter of measurement device fuel pipe, mm;   4 – air outlet end of measuring tube;  Carburettor 
Bowl  - 21 -   
d3 - diameter of measurement device fuel pipe, mm.         
 
Diagram B.3 Volum e Measurement Method  
(Fuel Measurement System when carburettor supplies fuel)        
 
 
 
hu – fuel upper limit, mm;      1 – levelling instrument fuel inlet;  
hl – fuel lower limit, mm;      2 – fuel tank outlet;   
ha – maximum measuring value of the measuring  tube, mm;  3 – fuel outlet of levelling instrument;  
d1 – diameter of original fuel pipe, mm;     4 – fuel inlet of levelling instrument;  
d2 – diameter of measurement device fuel pipe, mm   5 - air outlet end of measuring tube;  
d3 - diameter of measurement de vice fuel pipe, mm   6 – fuel tank inlet;   
d4 – diameter of air outlet tube of measuring tube, mm;   7 – air outlet tube of levelling instrument.   
Diagram B.4 Volume Measurement Method  
(Fuel Measurement System when fuel is supplied by fuel injection)  
 
 
 
 Carburettor 
Bowl  - 22 -  
d1 – diameter of original fuel pipe, mm;    1 – carburettor fuel intake;    
d2 – diameter of measurement device fuel pipe, mm;  2 – fuel tank outlet.   
d3 - diameter of measurement device fuel pipe, mm;   
 
Diagram B.5 Weight Measurement  
(Fuel Measurement System  when carburettor supplies fuel)  
 
 
d1 – diameter of original fuel pipe, mm;     1 – fuel tank inlet;    
d2 – diameter of measurement device fuel pipe, mm;   2 – fuel tank outlet.   
d3 - diameter of measurement device fuel pipe, mm;  
 
Diagram B.6 Weight Measure ment Method  
(Fuel Measurement System when the fuel is supplied by fuel injection)