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Carbs and Fuel System
From the gas tank to the carbs
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post #1 of 14 (permalink) Old 04-23-2016, 06:31 AM Thread Starter
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Hi. I just bought first motorcycle. Vulcan 750. 93' I took gas tank off and drained but the pet cock is funky looking, not to mention busted. Can I just bypass this until I can order a new one?
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post #2 of 14 (permalink) Old 04-23-2016, 06:32 AM Thread Starter
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Never ridden bike in life. Just scooters. Just trying to get this one operational
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post #3 of 14 (permalink) Old 04-23-2016, 06:44 AM
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Roadhopper waves hi.

Hey! Just saying hi and welcome since i'm awake, but i will leave the offeeshul welcome to the mods.

About the petcock.... short answer? I seriously doubt it. What would happen is that the carb would just flood. . . and i mean flood to the degree where it is just dripping out. BUT, that is just my understanding of the beast. I will leave the absolute correct answer to the masters as well.

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post #4 of 14 (permalink) Old 04-23-2016, 07:40 AM
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if the petcock is bad, there are 2 options, and the one to use is determined by how its failed..

1: Leaky petcock. you can rebuild them for cheap, or if you dont want to rebuild, you can use the following option as well...

2: physically broken/damaged. replacement. either with the factory type, or with a TW200 petcock, which bolts directly on to the tank. The TW200 petcock does not have the vacuum port, so it allows fuel to flow as long as its in the 'on' or' reserve' position. Also, it has only 1 outlet fitting, you would need to use a T fitting to hook the 2 fuel lines the vulcan has to the one port. many people have done this mod with no problems. The TW200 in a LOT cheaper than the original part, and remember to try to avoid the cheaper chinese knockoffs, as a few have had issue with them specifically.

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Sold 11-27-17
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post #5 of 14 (permalink) Old 04-23-2016, 08:18 AM
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Welcome. Tell us about your wrenching skills also so we get to know you better. If you just bought the bike, there are a few more things you should check. The splines on these can dry out or have never been lubed from the factory. Remove the rear wheel and check, Use Honda moly. Also, check your charging system. They tend to go out on theses'. Go to the verses section. It has a lot of good information. By all means, check the dates on your tires. They are the only things keeping you glued to the rode.
Plenty of info hear a lot's of fellow riders willing to help.

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post #6 of 14 (permalink) Old 04-24-2016, 08:28 PM
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Welcome to the Vulcan madness Ray.
See ten things link below in my signature line.
There is a lot of repetition in there, but if you read through to the end you will find a good summary by Jerry/750rider.


1991 VN 750 -"Cosmic Lady" or "Bad Girl"?
Purchased May 16, 2008
Approx.19,300km (12,000 miles)

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July 13, 2016, Riding on the DARKSIDE now, Classic Radial 165/80-15

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post #7 of 14 (permalink) Old 04-24-2016, 10:41 PM
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Welcome aboard, Rayguyver!

You can't really 'bypass' the petcock, but if the petcock isn't snapped off and you need to get on the road before a new part can ship, I'll throw this kludge out there:

buy a foot or so of fuel line, two 'T' connectors, and an in-line fuel-cutoff valve from your local auto parts store. Connect the two fuel outputs of your current petcock to one of the 'T's, joining them into one output. Install the cut-off valve. Add the second 'T' to the other side of the valve and connect your bike's fuel lines to each side. That will at least give you a way to manually turn your gas on when you need to ride and off when you stop riding so you don't leak gas everywhere.

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Vulcan slang for newcomers
Service Manual Download
Wiring Diagram + annotations * still undergoing revisions, but still more useful than the generic one. Let me know if you find mistakes or think something additional should be added
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post #8 of 14 (permalink) Old 04-28-2016, 04:36 AM Thread Starter
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Fuel shutoff

Can't I bypass a pet cock? Only to see if engine will run?
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post #9 of 14 (permalink) Old 04-28-2016, 04:43 AM Thread Starter
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Now I see how this forum works. I will post pictures shortly.
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post #10 of 14 (permalink) Old 04-28-2016, 04:51 AM Thread Starter
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I'm going with the tw200
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