<VV> Yenko Carbs Questions?

[Seth Emerson]

 Original Stage 1 + 2 Yenko all four carbs were originally stock Corvair carbs, usually with jetting changed. The customer racing Yenko Carbs were not rotated. Some were bored out and had relocated jets, but used standard (65-style) 140 throttle linkage - at least on YS003. Even before Yenko times, the aftermarket was already selling 4-carb kits with the epoxy-on carb mounts for other than 140 heads. Those usually rotated the primaries and mounted the secondary carbs to match. As far as I know you would have to rotate all four carbs, not just the secondaries! I have an installed set on early heads. The kits didn't come with carbs, though. How to Hot Rod Corvairs did, indeed, suggest the simpler (no-choke) 1960 carbs, probably cheaper in the used market, at the time. I guess you have to define "leaking" carbs. Technically, there is no place for gas to leak out of a 1960 float bowl, except through the jet. Where is the fuel coming out? are the venturis bored out? Are there oversize throttle plates installed. As Paul mentioned, those could cause a leak.Unless the customer really wants the red lowers, another pair of bottoms might solve the issue. If you rotate the carbs, with the kit on my engine, you have to go to all primaries, because the carbs all open together. At least you will need an accelerator pump shot. Of course, the 1960 carbs are primaries.
-Seth 
    On Monday, March 16, 2026 at 05:23:57 AM PDT, Paul Fox via VirtualVairs <virtualvairs at corvair.org> wrote:   

  Grant, look underneath. If it has a venturi sleeve epoxied into it over time they will leak. I had one do this. Bent a rod because of it. I don't know any way to fix it other than building s new one.  Paul Fox YS059

    On Sunday, March 15, 2026 at 03:04:19 PM EDT, Bryan Blackwell via VirtualVairs <virtualvairs at corvair.org> wrote:  
 
 I think using 1960 carbs as secondaries may have been mentioned in How to Hotrod Corvair engines.  The rotated adapters and linkage were offered by Otto Parts, perhaps others, and that setup was acquired by Clark's along with the rest of the Otto catalog.

--Bryan

> On Mar 15, 2026, at 2:44 PM, Mike Stillwell via VirtualVairs <virtualvairs at corvair.org> wrote:
> 
> Not stock from Yenko. Yenko secondary carbs were modified real secondaries. Often just with larger jets. A ‘60 base sounds like something a later owner swapped out.
> 
> Mike
> YS-117
> 
> Sent from my iPhone
> 
>> On Mar 15, 2026, at 11:28 AM, Grant via VirtualVairs <virtualvairs at corvair.org <mailto:virtualvairs at corvair.org>> wrote:
>> 
>> A customer just dropped off a set 140 carbs for rebuild from a Yenko Stinger since a repair shop in the Jacksonville area was not able to determine why they were leaking. The primaries seem normal, but the secondary ones are from 1960 and they have a sort of rotator linkage system on them similar to what Clark's sells. Hoping there are some owners on our site who can advise if these might be "stock" and if anything different was done to them back in the day that I should look for. They were painted red at some point in their history. If there is a Yenko site, please let me know.
>> Thanks,
>> Grant

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