Smog Block Off Plates for Yamaha model Sport Bikes. 
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). 
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
There are three reasons why you want to remove the air injection system from your bike.
Feature:
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.

Fitment:

For Yamaha

YZF R1 2003-2019              
YZF R1M 2015-2019
YZF R1S 2016-2019
YZF R6 2003-2019
YZF R6S 2006-2009
FZ1 / FZ1 Fazer 2006-2015
FZ6R/ FZ6 Fazer 600 2004-2015
FZ8 2010-2015
FZ-10 MT-10

Packaged Included:

1 Pair of Smog Block Off Plates