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Join Date: Nov 2007
Location: Chandler, Arizona
Completely open pipes, which have almost no backpressure, cannot be tuned, at least with carburetors. If there is one benefit to FI, it is that you can map it to deliver an exact air/fuel mixture throughout the rpm range, from idle to redline. There is no way you can do that with carbs, they have an idle circuit, pilot jets, and main jets. Without backpressure, you cannot get a consistent air/fuel mixture over a wide rpm range. With set jetting, it will be too rich in some spots, and too lean in others. There will only be a very narrow rpm range where they will be right on. Many Harley riders have seriously shortened the life of their carbed engines by running open pipes. I suggest getting some real motorcycle exhaust pipes before you destroy your engine. Or look into that FI conversion idea someone posted about.
I am a motorcyclist, NOT a biker.
1997 Vulcan 750, purchased about a week ago
2006 Sportster 1200 Low
2013 Royal Enfield Bullet 500, converted to carb
2001 Yamaha XT225, heavily modified
2004 Honda Rebel 250
1979 Vespa P200E
2002 Vulcan 750 parts bike
1994 Yamaha XT225 parts bike