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Author Topic: Bypassing Auto Fuel Shutoff Valve on 81 CB650  (Read 2932 times)

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Offline bilturner

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Bypassing Auto Fuel Shutoff Valve on 81 CB650
« on: January 09, 2014, 01:13:54 PM »
Wasn't careful enough when pulling the carb boots off my carbs and in the process accidentally broke brass fitting that attaches the Auto Fuel Shutoff valve to the #2 carb.   (red circle on attached)

Looks that part is no longer available to purchase anywhere on the planet...  I've seen some suggestions for just bypassing the AFV altogether.   

Anyone try to make a replacement part for this?  Or know of where to purchase one? 

If not, and I have to bypass the feature, anything tricky related to that?  I suppose I just trace the hoses from the fuel tank to the carbs and bypass the AFV by joining the fuel hoses....

Thanx
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Offline flybox1

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Re: Bypassing Auto Fuel Shutoff Valve on 81 CB650
« Reply #1 on: January 09, 2014, 01:20:23 PM »
Forum member harisuluv has helped many a member with carb parts.  send him a pm.
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'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

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Offline cb650

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Re: Bypassing Auto Fuel Shutoff Valve on 81 CB650
« Reply #2 on: January 09, 2014, 05:55:44 PM »
Plug the vacum port and remove that pos valve.     Do remember to shut off petcock at nite.  If you have to have it I have a few of them ports laying around if I can find them.
« Last Edit: January 09, 2014, 05:57:16 PM by cb650 »
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Offline fmctm1sw

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Re: Bypassing Auto Fuel Shutoff Valve on 81 CB650
« Reply #3 on: January 09, 2014, 05:58:11 PM »
Quote from: cb650 on January 09, 2014, 05:55:44 PM
Plug the vacum port and remove that pos valve.     Do remember to shut off petcock at nite.

+1.  Getting rid of that vacuum petcock is a common technique among 650 folks.  I don't even think you can find a rebuild it for it...
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Quote from: 754
Dude is that a tire ? or an O-ring..??

Quote from: inkscars
This is not a pod thread
This is not a #$%* on my vacuum gauges thread
This is a help or GTFO thread.

1973 CB350F
1973 CB350G
1975 CB550K
1983 GL650I
1973 CB750K3 (http://forums.sohc4.net/index.php?topic=92888.0)
1984 Kawasaki KLT-250 (AKA 3 wheeler of death)
1994 Honda TRX300
1999 Honda TRX250

Offline tomkimberly

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Re: Bypassing Auto Fuel Shutoff Valve on 81 CB650
« Reply #4 on: January 10, 2014, 01:20:21 AM »
Bypass the fuel cut off, and if your're lucky, get a set of VB44B or VB44C carbs.


Tom

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