


Graves Motorsports Yamaha YZF-R1 04-23 Smog Block Off Plates
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Graves Motorsports Yamaha YZF-R1 Smog Block Off Plugs for the 98-03 model year motorcycles. Graves Motorsports Smog Block Off Plates are designed to seal off the ports on the cylinder head 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. These Smog Block Off Plates are made from machined aluminum. There are two reasons why you want to remove the air injection system from your bike: