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Old 09-18-2015, 10:25 AM
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help with Tri-Power manual choke/fast idle cam

I am building my first Tri-Power carburetion with Rochester 2gs small base.My assembly is almost 90% complete with lots of help from others.It will have a manual choke on the primary.When you first try to start a cold engine will the manual choke need to totally block off the airhorn with the fast idle cam being on the highest step? I know that once the engine starts the driver will want to open the choke a bit,functioning as the "pull off" to let some air thru the airhorn.I know to set your curb idle and mixture first.So I just want to know about the position of the choke valve and fast idle cam as your getting ready to start the car on a cold start.Thanks.I may have a follow up question or two.When I say totally block off the airhorn I mean the way it sounds, so no air flows past the choke valve.

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Old 09-18-2015, 03:07 PM
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Pump the loud pedal twice.
Hold the throttle open 1/4 of the way.
Pull the choke and close the butterfly fully.
Turn the key and when it fires push the choke in enough to open the plate about 1/4 inch.
It should high idle right there.
As it warms up you'll need to push the choke in a bit more to keep it from being too rich.
The curb idle screw is used for your high idle (on a higher step on the cam) and your curb idle.
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Old 09-18-2015, 03:55 PM
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Thanks, that's exactly what I wanted to know.
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