Who's running Yamaha TW200 gas petcock??? - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 12 (permalink) Old 05-06-2012, 01:58 AM Thread Starter
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Who's running Yamaha TW200 gas petcock???

I just bought one but it's a 1/4" outlet and of course the Vulcan inlets are 5/16". What up?

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post #2 of 12 (permalink) Old 05-06-2012, 10:34 AM
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What's up?

It's for Yamaha.... The Vulcan is a Kawasaki.....

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post #3 of 12 (permalink) Old 05-06-2012, 11:50 AM
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I think this is the same petcock discussed on another thread from a year or two ago. One post indicated that the 750 starved for fuel from it at highway speeds.

It seems obvious to me that a petcock with single 1/4" outlet designed for a 200 cc engine will not supply enough fuel for the 750 cc Vulcan which has two 5/16" fuel lines.

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post #4 of 12 (permalink) Old 05-06-2012, 01:09 PM Thread Starter
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Quote:
Originally Posted by OlHossCanada View Post

It seems obvious to me that a petcock with single 1/4" outlet designed for a 200 cc engine will not supply enough fuel for the 750 cc Vulcan which has two 5/16" fuel lines.
I don't think so. Wasn't there one member that said it worked fine? I believe there was. That would mean the person having the "gas starving" had another problem. Clogged vent, dirty carbs, bad coil, etc. I mean who knows with these things, they have such a myriad of problems.

"Giving the Ralph to the prairie scrub of Grand Forks is like dressing up drunken monkeys in snowmobile jackets and packing them into the Ordway....."
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post #5 of 12 (permalink) Old 05-06-2012, 01:34 PM
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Quote:
Originally Posted by RxRC View Post
I don't think so. Wasn't there one member that said it worked fine? I believe there was. That would mean the person having the "gas starving" had another problem. Clogged vent, dirty carbs, bad coil, etc. I mean who knows with these things, they have such a myriad of problems.
The TW200 petcock does not allow as much gas flow as the VN750 petcock, so it is probably inadequate.

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post #6 of 12 (permalink) Old 05-06-2012, 05:53 PM
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Quote:
Originally Posted by thtanner View Post
The TW200 petcock does not allow as much gas flow as the VN750 petcock, so it is probably inadequate.
Yes, but what if you used 2 of them ? One on the left for one carb and one on the right for the other...

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post #7 of 12 (permalink) Old 05-07-2012, 12:06 AM Thread Starter
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Quote:
Originally Posted by thtanner View Post
The TW200 petcock does not allow as much gas flow as the VN750 petcock, so it is probably inadequate.
Not necessarily.

You're saying that if you opened the cap, removed the fuel lines and watched the tank drain that your 750 could burn gas that quickly under normal riding conditions? We're not talking about a big block Chevy here. These Vulcans are gas sippers.

"Giving the Ralph to the prairie scrub of Grand Forks is like dressing up drunken monkeys in snowmobile jackets and packing them into the Ordway....."
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post #8 of 12 (permalink) Old 05-07-2012, 12:10 AM
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Originally Posted by RxRC View Post
Not necessarily.

You're saying that if you opened the cap, removed the fuel lines and watched the tank drain that your 750 could burn gas that quickly under normal riding conditions? We're not talking about a big block Chevy here. These Vulcans are gas sippers.
Giver her a shot, and let us know the results.

1986 Kawasaki Vulcan 750
NGK Iridium Plugs #7803/DPR7EIX-9
Duralast Gold ETX15 AGM Battery
Coastered & Shaved
TOC MCCTs
Metzeler ME880 [110/90-19, 170/80-15]
Balance Dampers Replaced
Tuxedo Mod
Rebuilt Forks w/ Progressive Springs
V&H Cruzers
VN750.com Grill Cover
Meanstreak Seat
Emgo 23-92411 Handlebars
MOSFET FH012AA R/R


1990 Kawasaki Vulcan 750

1998 Honda VFR800 FI

2014 Honda VFR800F

1989 Pontiac Firebird Formula 350
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post #9 of 12 (permalink) Old 05-07-2012, 12:18 AM Thread Starter
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I'd love to then maybe we can have a definitive answer. My original petcock doesn't leak or anything but the in tank screens are both ripped. Plus I've never been a big fan of vacuum operated valves. You know that's something prevalent on bikes imported to the USA only.

I'm not really concerned with flow, the reason I started the thread is the problem of having to go to from a 1/4" line to a 5/16". I'm surprised this wasn't mentioned in any other threads.

I went to my local parts store and they had nothing. I'd like a barbed, brass connector that steps from 5/16" to 1/4".

Any direction or link would be appreciated.

"Giving the Ralph to the prairie scrub of Grand Forks is like dressing up drunken monkeys in snowmobile jackets and packing them into the Ordway....."
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post #10 of 12 (permalink) Old 05-07-2012, 12:35 AM
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5/16" to 1/4" is very close, and 1/4"ID hose will fit snugly over 5/16" fittings. I'd guess you need a 1/4" ID "T" fitting.

1986 Kawasaki Vulcan 750
NGK Iridium Plugs #7803/DPR7EIX-9
Duralast Gold ETX15 AGM Battery
Coastered & Shaved
TOC MCCTs
Metzeler ME880 [110/90-19, 170/80-15]
Balance Dampers Replaced
Tuxedo Mod
Rebuilt Forks w/ Progressive Springs
V&H Cruzers
VN750.com Grill Cover
Meanstreak Seat
Emgo 23-92411 Handlebars
MOSFET FH012AA R/R


1990 Kawasaki Vulcan 750

1998 Honda VFR800 FI

2014 Honda VFR800F

1989 Pontiac Firebird Formula 350
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