Simmons / Duplex Carburetor

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Mark Osterman
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Simmons / Duplex Carburetor

Post by Mark Osterman » Tue Oct 12, 2021 8:32 am

Found this Duplex “straight through” carburetor at Hershey and it needs new valve discs. The parts are the same as the NH carburetors. Seems that they don’t have a wire retaining clip or screws. So is the disc a friction fit?
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speedytinc
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Re: Simmons / Duplex Carburetor

Post by speedytinc » Tue Oct 12, 2021 8:39 am

Seems to me, they used a single screw in the middle of the shaft. This choke shaft could have been changed also. Late T butterfly with the 3 tabs will work.


Topic author
Mark Osterman
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Re: Simmons / Duplex Carburetor

Post by Mark Osterman » Tue Oct 12, 2021 9:28 am

There are no holes in the shafts. I can switch out the shafts with new NH shafts.


FATMAN
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Re: Simmons / Duplex Carburetor

Post by FATMAN » Tue Oct 12, 2021 9:33 am

Use the 3 tab butterfly, Bob


Scott_Conger
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Re: Simmons / Duplex Carburetor

Post by Scott_Conger » Tue Oct 12, 2021 9:55 am

Mark

save and clean the jet and save and clean/sharpen the needle. They are most definitely not the same as NH parts. The float valve is the same though.
Scott Conger

Tyranny under the guise of law is still Tyranny

NH Full Flow Float Valves
Obsolete carburetor parts manufactured

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Corey Walker
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Re: Simmons / Duplex Carburetor

Post by Corey Walker » Tue Oct 12, 2021 11:45 am

Those came with a dimple in the center of the butterfly that made a friction fit. Al see o if you want to use the butterfly with the staple you can just drill 2 holes in the shaft you have there.
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Corey Walker, Brownsboro, Texas


Scott_Conger
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Re: Simmons / Duplex Carburetor

Post by Scott_Conger » Thu Dec 01, 2022 9:50 am

originally, both the throttle and the choke only had one screw holding them in...

Don't lose that screw!! It is a very unusual thread. I can make them, but they are expensive.
Scott Conger

Tyranny under the guise of law is still Tyranny

NH Full Flow Float Valves
Obsolete carburetor parts manufactured

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