Graves Motorsports Honda CBR250R 11-14 Smog Block Off Plate
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Graves Motorsports Smog Block Off Plate for Honda CRF 450L, CRF 450RL and CRF 450X 2019-2022. Graves Motorsports Smog Block Off Plates are designed to seal off the ports on the valve cover used by the air injection system (a.k.a smog pumps or AIS). Sold as 1 plate shown. This product is intended for closed course competition use only. Use of this product for any other purpose is strictly prohibited.
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;