Fuel Evaporative System on a 86 750 - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 6 (permalink) Old 04-22-2013, 10:30 AM Thread Starter
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Fuel Evaporative System on a 86 750

Hey I am just curious if someone can tell me if the Fuel Evaporation System on a 86 Vulcan 750 can be bypassed, I am new to motorcycles and recently bought a Vulcan that was in parts and as far as I can tell the guy who owned it had closed off the two openings coming from the back of the gas tank that go to the fuel evaporation system, how is this going to effect the bike?
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post #2 of 6 (permalink) Old 04-22-2013, 06:27 PM
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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
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post #3 of 6 (permalink) Old 04-22-2013, 06:48 PM Thread Starter
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Hmmm well I am not sure what to do then because where the hoses use to come out of the tank has been removed and sealed, dont have the parts he removed
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post #4 of 6 (permalink) Old 04-22-2013, 07:15 PM Thread Starter
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Well either way thank you very much for the help
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post #5 of 6 (permalink) Old 04-22-2013, 07:15 PM
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Bones...do a site search for "coastering" and "earshave"...its all here in detail.



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post #6 of 6 (permalink) Old 04-22-2013, 07:44 PM
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Quote:
Originally Posted by Bones432 View Post
Hmmm well I am not sure what to do then because where the hoses use to come out of the tank has been removed and sealed, dont have the parts he removed

Are you talking about the 2 fittings at the back of the tank, under the front of the seat? They are metal and are actually welded to 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
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