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Graves Smog Block Off Plugs for 98-03 Yamaha YZF-R1
Product ID : 4693087
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4693087
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About Graves Smog Block Off Plugs For 98-03 Yamaha YZF-R1
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"
