A restrictor plate or air restrictor is a device install... - dofaq.co
restrictor plate

A restrictor plate or air restrictor is a device install...

wikipedia - 07 Jul 2015
A restrictor plate or air restrictor is a device installed at the intake of an engine to limit its power. This kind of system is occasionally used in road vehicles (e.g., motorcycles) for insurance purposes, but mainly in automobile racing, to limit top speed to provide equal level of competition, and to lower costs; insurance purposes have also factored in for motorsports.

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