Yamaha R1 R6 FZ6 FZ1 R6S ZX6R ZX Race Smog Block Off Plates
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Yamaha R1 R6 FZ6 FZ1 R6S ZX6R ZX Race Smog Block Off Plates

Price: $22.00
  • Item #: R1R6KA-SP
  • Manufacturer: MJSperformance
  • Condition: New
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MJS Performance Smog Block Off Plates for Yamaha and Kawasaki model Sport Bikes. MJS Performance 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 in pairs 

Manufactured on state of the art CNC machines



  • Yamaha R1 2004-2017 + R6 2003-2017 + R6S 2006-2009 + FZ1 All + FZ8 All + FZ6 All
  • Kawasaki ZX6R 2003-2008 + ZX6RR 2004-2006 + ZX12 2004-2005
  • Please note: For Kawi install, mounting holes may need to be drilled by 1MM larger but test try first to confirm.

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 6061 billet aluminum and feature the MJS 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.