Document ID: chunk:federal_register_of_legislation:F2021C00509:front:0:p44
Version: federal_register_of_legislation:F2021C00509
Segment Type: other
Provision Reference: 
Character Range: 128527–131361

the speed specified under item 9 of annex 1.
         If, in the test at a steady speed of 50 km/h, the gears change down to first, the approach speed of the motorcycle may be increased to a maximum of 60 km/h to avoid the change down.

1.4.3.2.2.2. Position of the manual selector

         If the motorcycle is equipped with a manual selector with X forward drive positions, the test shall be carried out with the selector in the highest position; the voluntary device for changing down (e.g. kickdown) shall not be used. If an automatic change down takes place after line AA', the test shall be begun again using the second highest position or the third-highest position if necessary, in order to find the highest position or the selector at which the test can be performed without an automatic change down (without using the kickdown).

1.5. Results

         1.5.1. The communication referred to in annex 1 shall indicate any circumstances and influences affecting the results of the measurements.

1.5.2. Readings taken shall be rounded off to the nearest decibel.
         If the figure following the decimal point is between 0 and 4, the total is rounded down and if between 5 and 9, it is rounded up.
         Only those measurements whose variation in two consecutive tests on the same side of the motorcycle is less than or equal to 2 dB(A) may be used for the purpose of issuing the communication referred to in annex 1.

         1.5.3. To take account of inaccuracies in the measurements, the result of each measurement shall be arrived at by deducting 1 dB(A) from the value obtained in accordance with 1.5.2.

         1.5.4. If the average of the four results of the measurements does not exceed the maximum permissible level for the category to which the motorcycle being tested belongs, the limit laid down in paragraph 1.1. will be deemed as being complied with. This average value will constitute the result of the test.

         2. Noise from stationary motorcycle (measuring conditions and method for testing of the vehicle in use).

2.1. Sound-pressure level in the immediate vicinity of the motorcycle

         In order to facilitate subsequent noise tests on motorcycles in use, the sound-pressure level shall also be measured in the immediate vicinity of the exhaust-system outlet in accordance with the following requirements, the result of the measurement being entered in the communication referred to in annex 1.

2.2. Measuring instruments

         A precision sound-level meter as defined in paragraph 1.2.1. shall be used.

2.3. Conditions of measurement

2.3.1. Condition of the motorcycle

         Before the measurements are made the motorcycle engine shall be brought to the normal operating temperature.

         If the motorcycle is fitted with fans with an automatic actuating mechanism,