SAE J1287_200805

This SAE Standard establishes the test procedure, environment, and instrumentation for determining the exhaust sound pressure levels of motorcycles under stationary conditions. Care must be taken not to confuse stationary sound pressure levels with total motorcycle sound pressure levels. This test does not evaluate total motorcycle sound during operation. For this purpose, SAE J331 or SAE J47 is recommended. Any allowable sound limits (dBA) set in relation to SAE J1287 for exhaust sound pressure level should not conflict with the allowable sound limits (dBA) for total sound pressure level per the EPA requirements specified in the US Code of Federal Regulations, 40 Part 205. This Revised document has been changed to reflect the experience gained with its use in the time since its last revision. The alternate engine speed equations, intended for use in cases where the rated engine speed is not known have been eliminated as experience has shown that results using these alternate speeds may be unreliable. Requirements have been added for recording test condition data. The wording of some sections has been changed or rearranged, and the numbering changed accordingly. It has also been revised to comply with the new SAE Technical Standards Board Format.