- 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 ease of maintenance.
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.
WR250R 08-15, WR250X 08-10
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