Graves Motorsports Honda CBR600F4 99-00 Smog Block Off Plates
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Graves Motorsports Smog Block Off Plate for the Honda CBR250R 2011-2014. Graves Motorsports Smog Block Off Plate are designed to seal off the ports on the valve cover used by the air injection system (a.k.a smog pumps or AIS).
The air induction system (AIS) burns unburned exhaust gases by injecting fresh air (secondary air) into the exhaust port, reducing the emission of hydrocarbons.
Once these are capped off the air injection system can be safely removed. These Smog Block Off Plates are made from CNC'ed billet aluminum and feature the Graves Motorsports "G" logo. There are three reasons why you want to remove the air injection system from your bike;