1981 CB650 Air cutoff valve

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ts354
Posts: 12
Joined: Fri Jun 01, 2018 2:15 pm

1981 CB650 Air cutoff valve

Postby ts354 » Mon Jan 06, 2020 9:47 pm

1981 CB650 Air cutoff valve

Does anyone supply a rebuild kit for this model? It's a single unit between carbs 3 & 4.

Thanks,
Todd

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Volker_P
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Joined: Mon Mar 06, 2006 1:53 am
Location: southern Germany

Re: 1981 CB650 Air cutoff valve

Postby Volker_P » Tue Jan 07, 2020 2:59 am

ts354 wrote: It's a single unit between carbs 3 & 4.

Probably you think of the "vacuum shutoff" for the fuel line that sits on top of cabs 3+4 of some CV carbs, right?

Only early PD carbs seem to have the four diaphragms that are typically related to "air cutoff" elsewhere in this forum.
Cosky's great (free) online manual: http://cosky0.tripod.com

forum links to common technical issues

ts354
Posts: 12
Joined: Fri Jun 01, 2018 2:15 pm

Re: 1981 CB650 Air cutoff valve

Postby ts354 » Tue Jan 07, 2020 8:29 am

Ahhh yes, you are correct sir! Thank you Volker. :D

So the question changes a little to: Does anyone know of a rebuild kit for the Vacuum (fuel) Shutoff valve?
It seems as if this little valve was only produced for the 1981 bike and I can't seem to find it anywhere.
I even downloaded K&L's catalog and couldn't find anything.
Thank you again Volker_p for clarifying.

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GeorgeSweety
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Location: UK.

Re: 1981 CB650 Air cutoff valve

Postby GeorgeSweety » Tue Jan 07, 2020 2:38 pm

Most people bypassed them and put a normal gravity fed fuel tap on the bike as they were always causing problems. They were sometimes affectionately know as SOS valve aka Spawn Of Satan.


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