factory Rev Box works by interrupting the firing HP that is distributed to the plugs, this prevents the engine from operating above a preprogrammed rotational speed known as the red line limit. This may be useful in say a rental boat but very vexing when fitted to racing or tuned-up Boats. Sometimes CDI Box is applied to prevent an engine from reaching the point at which it develops max power. This is usually implemented to prevent damage to the power train. stock CDI Box on EFI engines is a surveillance-software placed in Power Control Module to restrict its maximum rev.
An adjustable Johnson 50 EFI RPM governor provides more precise control over ignition and Rev limit than the original components built in by the manufacturer.
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