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Join Date: Nov 2007
Location: Chandler, Arizona
Yes, it can be bypassed. It can be removed completely. Those 2 fittings need to be open, or at least one of them does. One is the tank vent, the other is an overflow. The hoses that attached to them originally went to a canister right above the front of the swingarm. If it is still there, it can be thrown away, along with all associated plumbing. I just took 2 rubber hoses of the right size, put them on the fuel tank fittings, and ran them through the 2 holes in the frame, and down below the bike. If you really overfill the tank, you can spill some gas out of one of them (can't remember which is which at the moment) but I still leave them both open to make sure my tank is vented. Ethanol gas tends to melt that little rubber grommet under the gas cap, and that is the vent. If it plugs up, the overflow provides another vent.
If you still have it or the parts, I would remove the complete air injection system as well. All it does is make the exhaust run hot and cause backfiring.
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