Quote:
Those are the Air Injection tubes. They make the bike run lean
Wait! I hate to be contrary, but this is a little misleading. The air injection doesn't really affect how the bike runs to any important degree. It doesn't make it run lean. The AI system injects air into the exhaust area, downstream from the exhaust valve, causing any unburned gases to reignite after they have left the combustion cylinder. The extra dose of oxygen causes any unburned gases to reignite as they enter the header pipes. The heat from these burning gases is what causes the pipes to turn blue. Removing the AI keeps your chrome pipes from bluing, but it also slightly increases the amount of unburned hydrocarbons coming from your tailpipe.
The AI is there only to help Triumph meet EPA regulations. It's illegal for the dealer to remove the AI, but some dealers do it anyway. Most owners pull it off themselves unless they have to meet some strict emissions tests.
There was some discussion long ago on the old board about putting a second spark plug in the AI hole, until we discovered that hole does not enter the combustion chamber.
Regards,
Cody
Last edited by Cody; 01/08/2007 5:02 PM.
