Whats today's Petcock answer...

[neJeff]

Yes you can with no fuel starvation problems, run a line with one filter into a T, then down to the 2 carb inlets.

Well I have four petcocks to work with so I'll start disassembling cleaning, etc and see if I can get a good pair of parts together and order some rubber bits and make this thing work. If not two then one will do. Very complete writeup that guy did!

[bikerphil]

Can you run just ONE petcock?

Yes you can with no fuel starvation problems, run a line with one filter into a T, then down to the 2 carb inlets.

[jetmechmarty]

There's a lot of good information in that thread. It doesn't solve the Photobucket problem but in one of the last posts, XJBikes member Ian Vanore made a really good PDF with all of the text and pictures and put it on his Google Drive:-

XJBikes.com > Forums >XJ Motorcycle Forums > XJ DIY How-To Instructions >
Rebuilding the Yamaha Vacuum Fuel Valve w/pics
Discussion in 'XJ DIY How-To Instructions' started by bigfitz52, May 9, 2010. page-4#post-566329

The nice thing is you may download that pdf.

[3Phase]

Here's how to successfully rebuild the petcocks:

http://xjbikes.com/forums/threads/re...-w-pics.25058/

Edit: damb no pics

There's a lot of good information in that thread. It doesn't solve the Photobucket problem but in one of the last posts, XJBikes member Ian Vanore made a really good PDF with all of the text and pictures and put it on his Google Drive:-

XJBikes.com > Forums >XJ Motorcycle Forums > XJ DIY How-To Instructions >
Rebuilding the Yamaha Vacuum Fuel Valve w/pics
Discussion in 'XJ DIY How-To Instructions' started by bigfitz52, May 9, 2010. page-4#post-566329

[jetmechmarty]

If the kit is available OEM, that's what you want. Aftermarket kits for these things are iffy at best.

[Rasputin]

Rebuild kits are great

I first rebuilt a petcock on my 1970 HS-1 90cc twin In 1971. All I have ever had to do was clean up the parts and install the new kit.
I have had as many as 11...XS11's at a time and never had an issue with a rebuilt petcock. Some of them were in dire need of help, but nothing that a thorough cleaning would not fix. Many on here give up and switch to the peoples choice at the moment.
The surfaces of the petcock really have little to do with anything as long as they are not abrasive. The rubber will last only so long, no matter what you do. Enough turns on the dial "on/off" will wear out any rubber component, or the rubber will age.
The one thing to be certain of on these bikes is that the snout and O-ring are correct for your bikes vacuum requirements. Many manufacturers have a wiggle room built in.
The most common mistake with the fuel valves is the position of the petcock handle. I would bet that over 50% of the new owners do not know the correct way to do it.

[Schming]

time for a rebuid

Here's how to successfully rebuild the petcocks:

http://xjbikes.com/forums/threads/re...-w-pics.25058/

Edit: damb no pics

[skids]

Well, i went to the link. It lists the 1978 xs1100 (standard only) and it also lists other years specials. I can tell you that there is an apparent mistake with applicability. The standard and special petcocks are very different with both size and function. Get more explanation before ordering!!!

[neJeff]

Two sets of petcock(s) are no good

Is this one the answer then http://www.ebay.com/itm/Yamaha-Petco...RZAfqm&vxp=mtr

I hear lots of mixed results on rebuild kits. What's the biggest failure points on these things? Can you run just ONE petcock? Is there enough fuel flow?

Thanks