Gas tank vent tube...help me - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 10 (permalink) Old 10-04-2011, 06:50 PM Thread Starter
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Gas tank vent tube...help me

I had poogs problem but solved that 6 months ago from forum info.My quetion is ,my tank vent tube has now come off and I see that it had a crack right where it was fastened that would have allowed air in up high by tank.Would that have caused bike to run rough,it was running perfect just 2 days ago and what do I have to do to replace vent tube...prior to today my bike has been running good at80mph and then running rough usually when I slow down
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post #2 of 10 (permalink) Old 10-04-2011, 09:00 PM
If only it had 6th gear..
 
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do you mean the metal tube is cracked where it's soldered to the tank?

Dave

Mods:
Jetted, shaved & coastered
Home made under-tank single filter
Converted ACCT's to manual (thanks wib714)
Dual vac lines on petcock (my cure for ticking)
LED tail/plate lights
Relocated helmet lock to license plate

Added stuff:
Customized hard bags w/ lights
Chrome levers
Hellcat windscreen
LED running lights
Home made 'Vita-Volt' meter
Foot rests on engine guard
Tunes

Hmm....she was on the back when we left.... ??
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post #3 of 10 (permalink) Old 10-05-2011, 11:03 AM Thread Starter
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No i was only talking about the rubber hose and now I see where oit was attached to tank and have put it back on...The hose could have been off forv a day or two and was wondering if that could make machine run rough,more then likely it would just make a mess on the bike
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post #4 of 10 (permalink) Old 10-05-2011, 12:05 PM
Crap, I WAS in 5th gear.
 
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Vent lines coming off shouldn't affect how the engine runs, unless when the tube came off the metal tube was sealed up against the seat. Sounds like maybe a coincidence?
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post #5 of 10 (permalink) Old 10-05-2011, 07:23 PM Thread Starter
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You are right that could be that it would occasionally get sealed by the seat..thanks for the reply
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post #6 of 10 (permalink) Old 10-06-2011, 03:04 PM
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May not be a bad idea to clear out the vent line anyway.

Corey
97 VN 750 purchased 6/2011 23kmi
NGK Plugs
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More mods to come........
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post #7 of 10 (permalink) Old 10-07-2011, 07:34 PM
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On mine...

On mine, Ive always just had that tank vent tube vacant (just the fitting) bike ran great...I did however throw an 8" piece of rubber on it though, so, if a clog occured, wouldnt just suck up into tank. But should help perf actually and not hinder, because I believe originally that was to be hooked to the airbox eventualy for that emissions stuff...leave it open, and tank breathes free...you may want to cover the end with a small piece of open cell foam though to act as a mini-filter...
But...if you havent done away with your airbox and gawdy filters yet, you may want to find the inlet and plug it with a sheet metal screw...if you dont, it could affect total vacuum possibly, but not sure...



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post #8 of 10 (permalink) Old 10-11-2011, 08:15 PM
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Having a CA model tank is actually a good thing when it comes to tank venting. Once you remove all the emissions crap, you actually have 2 tank vents, and one cannot fail. I ran rubber hoses from both mine, from the back of the tank down under the bike. Some time ago, I looked at another guys Vulcan 750, who was having this poog issue. His was a non CA model, and only had one vent hose fitting. It is vented through that tiny little grommet under the gas cap. Using alcohol gas had caused that to swell up, and cut off air flow. I removed it, and the bike ran fine. But with the CA tank, the other vent has no rubber parts, other than the hose. And guess what? I found the very ends of both my vent hoses (under the bike) all swollen, from using alcohol gas. Found the same thing on the carb vent hoses, and on the external gas cap mounted vent hose on my dirt bike. Not too long after finding the swollen hose on the dirt bike, an '02 XR400 bought used, the plastic gas tank cracked. And it was not from a crash, or sitting out in the sun. The vent hose was open. The alcohol in the gas simply destroyed the genuine Honda gas tank. Alcohol gas is some really bad stuff, and can and will destroy all the plastic and rubber parts in your fuel system. It may take a while, but it will happen. I would avoid using it if at all possible, unfortunately it is the only thing available in my state.

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 #9 of 10 (permalink) Old 10-11-2011, 09:34 PM
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Siiiiigh....

When will these companies learn, that alcohol is for drinking, and not for killing engines !!!!!...bring back the days of Sunoco 280 (yes, 280, not 260...280 was aviation fuel and worked great in hot rods with high compression)...
Adding alcohol to fuels only "waters it down", whilst adding more profit to the oil companies...no real benefit in it unless %100 alcolol, and even then, it needs to be mixed with oil to run in most engines (WW1 aerocraft engines ran on alcohol mixed with castor oil (origins of the name Castrol, btw...bean oil)...
My Vulcan(700, not a 750) is supposed to run on min 91 octane....well, hard to find unless you get premium...which is usuall 93 for Sunoco...midrange however is 89....so, I mix the 2 50/50......should be close....



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post #10 of 10 (permalink) Old 10-12-2011, 01:01 AM
If only it had 6th gear..
 
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It infuriates me that not only do we get shafted having to pay three times what we should for gas, they ruin our mileage, performance and internal parts with this ethanol bs! .... now, what do you guys think of this? http://www.bellperformance.com/ethan...s-hard-to-find

I know that Seafoam is good stuff but I thought this was interesting...
Benefits
•Counteracts the Effects of Ethanol
•Protects against Ethanol Damage
•Increases Mileage
•Lubricates Upper Cylinder Area
•Removes Carbon Deposits
•Dissolves Gums and Varnishes
•Extends Spark Plug Life
•Removes Water in Your Fuel
•Improves Horsepower
•Reduces Harmful Emissions
•Prolongs Engine Life

Dave

Mods:
Jetted, shaved & coastered
Home made under-tank single filter
Converted ACCT's to manual (thanks wib714)
Dual vac lines on petcock (my cure for ticking)
LED tail/plate lights
Relocated helmet lock to license plate

Added stuff:
Customized hard bags w/ lights
Chrome levers
Hellcat windscreen
LED running lights
Home made 'Vita-Volt' meter
Foot rests on engine guard
Tunes

Hmm....she was on the back when we left.... ??

Last edited by DavesVulster; 10-12-2011 at 01:08 AM.
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