Smog Block Off Plates for Kawasaki 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 Kawasaki 
NINJA 250 2008-2012
NINJA 300 2013-2020
NINJA 650 2006-2020
VERSEYS 650 2011-2020
Z650 2017-2020
VULCAN S 2015-2017

Packaged Included:
1 set of Smog Block Off Plate