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Join Date: Nov 2007
Location: Chandler, Arizona
The stock carb vent system is a poor design. It uses a hose from each carb, then they connect to a T fitting and become one hose, which fits into a clip on the right air filter housing. This setup has two problems. One, using the T fitting cuts the hose inside diameter in half, and the place where the end is supposed to go has been known to plug it up. I took 2 separate hoses, put one on each carb, and ran both of them down below the bike. The ends should be left open. These vents just make sure there is atmospheric pressure in the carb float bowls. The fuel tank vent is supposed to maintain atmospheric pressure in the tank.
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