Graves Motorsports Smog Block Off Plates for Yamaha and Kawasaki model Sport Bikes. 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). Sold in pairs
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 and feature the Graves Motorsports "G" logo. There are two 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.
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Graves!!!
Block off plates easy to install if you have any mechanical skills. Instructions easy to follow. I still have some popping on decel but I think the bike may just need to be tuned.
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Great quality product as expected
Quality from graves, fits great and eliminates back fire when installing with cat eliminator exhaust. Worked great!
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Bike still gurgles and backfires
I installed the Graves block-off plates with a Hindle cat-eliminator exhaust on my 2015 R1. The bike still backfires on aggressive deceleration. It may be that this condition can be cured with some custom dyno tuning and a map. But FYI. PS: It may be obvious But if you are planning this install after watching STG's video, DON'T install upper air box screws with your impact wrench. Use hand screwdriver. (Uninstalling with impact wrench is ok.)
- Availability:
- STG Part Number:
- G|1572-AB011|0
- Manufacturer's Part Number:
- 1
