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Join Date: Nov 2007
Location: Chandler, Arizona
At the rear of the gas tank there are either one or 2 nipples, depending on whether it is a CA model or not. They have 2. Nothing needs to be attached to either one for it to run properly, but if you have the CA model, the hose that connected to one of them needs to be plugged. I have a CA model (two of them now) and I just removed all the CA emissions crap and connected a hose to each one, and ran it down under the bike. Gas will come out of one of them if you fill the gas tank really full. There is a vacuum fitting on the right side carb that a small hose attaches to. That hose goes to the AIR system, another piece of emission crap that I removed. If the hose is there you can hook it up, or you can just cap the nipple on the carb. You should not hear any hissing sounds from anywhere. The way I look for vacuum leaks is to take an unlit propane torch, open it up just a little, and move it around any place where a vacuum leak might be. If the engine idle suddenly increases, you found a vacuum leak.
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