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

What's up?

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

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.

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.

Yes, but what if you used 2 of them ? One on the left for one carb and one on the right for the other...

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.

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.

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.