Graves Motorsports Smog Block Off Plate Honda

Graves Motorsports Smog Block Off Plate for the Honda (multi fitment see below). 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). Fitment:

HONDA CB300F 2016-2018

HONDA CB300FN 2021-2022

HONDA CB300R 2019-2021

HONDA CBR250R 2011-2014

HONDA CBR300R 2015-2023

HONDA CRF250L 2013-2020

HONDA CRF250RL 2019

HONDA CRF250RL (Rally) 2017-2018

HONDA CRF300L 2021-2025

HONDA CRF300L Rally 2021

HONDA CRF300LR 2021-2025

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;

1. If you are using your motorcycle on a closed course (racing, track days, etc.) you will want to remove all unnecessary equipment from your bike for reduced weight and ease of maintenance.

2. To get an accurate Air:Fuel (A/F) ratio when dynoing the bike. The air injection system pumps fresh air directly into the exhaust stream in order to burn off any unused fuel. Unfortunately by doing this the A/F ratio is thrown off by the extra "fresh air" in the exhaust stream. By removing the air injection system you can achieve an accurate A/F ratio.

3. This addition will typically remove the majority of popping on deceleration that can be experienced with un-burnt gasses within the emission charcoal chamber. Note: Proper tuning may be needed and this is general feedback.

Part number: AB014