08-19 YAMAHA WR250R: Graves Smog Block Off Kit

08-19 YAMAHA WR250R: Graves Smog Block Off Kit

• 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).
• Once these are capped off, the air injection system can be safely removed.
• Made from machined aluminum.
• Sold in pairs.
• There are two reasons why you want to remove the air injection system from your bike: 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

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"