Document ID: chunk:federal_register_of_legislation:F2021C00509:front:0:p43
Version: federal_register_of_legislation:F2021C00509
Segment Type: other
Provision Reference: 
Character Range: 125896–128731

opened as quickly as practically possible and kept in that position until the rear of the motorcycle reaches line BB'; the throttle must then be returned as quickly as possible to the idle position.
          For all measurements the motorcycle must be ridden in a straight line over the acceleration section keeping the longitudinal median plane of the motorcycle as close as possible to line CC'.

1.4.3.1. Motorcycles with non-automatic gearboxes

1.4.3.1.1. Approach speed

         The motorcycle shall approach line AA' at a steady speed of:
             (i)                 50 km/h
             or
             (ii)               speed corresponding to an engine speed equal to 75 per cent of the speed specified under item 9 of annex 1.

         The lower of these speeds shall be selected.

1.4.3.1.2. Selection of gear ratio

         1.4.3.1.2.1. Motorcycles fitted with a gearbox having a maximum of four ratios, whatever the cylinder capacity of their engines, shall be tested only in second gear.

         1.4.3.1.2.2. Motorcycles fitted with engines having a cylinder capacity not exceeding 175 cm3 and a gearbox with five ratio or more shall be tested only in third gear.

         1.4.3.1.2.3. Motorcycles fitted with engines having a cylinder capacity of more than 175 cm3 and a gearbox with five ratios or more shall be tested once in second gear and once in third gear. The result used must be the average of the two tests.

         1.4.3.1.2.4. If, during the test carried out in second gear (see paragraphs 1.4.3.1.2.1. and 1.4.3.1.2.3), the engine speed on the approach to the line marking the end of the test track exceeds 100 per cent of the speeds specified under item 9 of annex 1, the test must be carried out in third gear and the sound level measured shall be the only one recorded as the test result.

1.4.3.2. Motorcycles with automatic gearboxes

1.4.3.2.1. Motorcycles without a manual selector

1.4.3.2.1.1. Approach speed

         The motorcycle shall approach line AA' at steady speeds of 30, 40 and 50 km/h or 75 per cent of the maximum road speed if that value is lower. The condition giving the highest sound level is chosen.

1.4.3.2.2. Motorcycles equipped with a manual selector with X forward drive positions.

1.4.3.2.2.1. Approach speed

         The motorcycle shall approach line AA' at a steady speed of:
              (i)                 less than 50 km/h, the engine rotation speed being to equal to 75 per cent of the speed specified under item 9 of annex 1,
              or
              (ii)               50 km/h, the engine rotation speed being less than 75 per cent of 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