Stock hitachi electric choke

[converted_to_datsun]

So I rebuilt my stock hitachi carb when I got my 79 620. And after that I had problems with the choke so I put a manual choke kit on. Well I was thinking and I took the electronic choke off and probably re-installed it wrong.

 

Anyway how do you put the electric choke on the stock carb correctly?

[Dat Lurka]

Anyway how do you put the electric choke on the stock carb?

 

correctly

[datzenmike]

The choke has a coil inside it, actually a bi metallic strip that unwinds when heated by the electric heater element inside it. If you look there is a loop on the end in the center that must have the choke plate rod through it. This way when the coil unwinds it turns the choke plate to the open position. When it cools it winds up tighter and closes the choke plate.

[converted_to_datsun]

Awesome! I knew you'd come through mike. In the morning I'll put it back on and see how it works

[datzenmike]

Just look in at how it's oriented and slip it on so the shaft from the choke plat fits in. It might take several tries but when done correctly, you should be able to twist the choke heater and the choke plate will open and close.

[converted_to_datsun]

I don't even wanna say how I installed the choke last time lol

[Rays74]

Haha.......lemme know if you need pics, Con'vert :) It usually takes me a couple of cold morning starts to see if I have my chokes twisted close to right :)

--Ray

[converted_to_datsun]

Well it's back on and running great.... One small kinda dangerous problem haha throttle gets stuck and I have to put the clutch in and rev to get controle back. I tried adjusting the choke a bit and it did help but still does it sometimes.... Adjust the choke more? Or am I having bigger problems?

[datzenmike]

That's likely normal.

 

In operation, when on, the choke will force an over rich condition and will run poorly at normal idle. Therefore there is a fast idle setting that is used whenever the choke is on. This fast idle of 1,800 to 2,200 RPMs warms the motor faster and makes it easier to drive when cold.

 

You do not have to wait for the motor to warm up. 15-20 seconds to check everything and put on your seat belt is plenty. Waiting to warm up is a waste of gas. Drive as soon as it is safe to do so.

[converted_to_datsun]

It's running great at idle. The problem happens when driving. The throttle takes off by itself and keeps accelerating. And it's after it's already warmed up

[datzenmike]

Throttle cable too tight

Throttle shaft worn and sticking in the carb casting.

Improper return spring.

[converted_to_datsun]

Well it had no issues at all till I put the electric choke back on. Also the gas pedal returns to normal position when I release it. But it keeps accelerating like I'm on the gas

[Rays74]

To add to Mike's list above.......

 

Thr cable worn and dragging.

Thr cable bracket misaligned with carb allowing drag

[Dat Lurka]

Make sure you have that little wooden ring in the throttle shaft holder

[datzenmike]

Well it had no issues at all till I put the electric choke back on. Also the gas pedal returns to normal position when I release it. But it keeps accelerating like I'm on the gas

 

Then the fast idle cam may be sticking on. Spray carb cleaner or WD-40 in this area...

 

See the screw with the little lock nut? Just above is the plastic fast idle cam. It has steps on it and rotates with the choke to give faster or slower idle when the choke is on. When the choke is off it should fall down out of the way by it's own weight. Spray it well, hold the throttle open and open and close the choke butterfly by hand. You should see this fast idle cam turn back and forth. Likely the linkage is dirty and sticking.

 

.

[converted_to_datsun]

That sounds like it could be the problem. I'll try that and see if it fixes anything

[converted_to_datsun]

I just lubricated my linkage and adjusted my choke again. Then I adjusted the mixture, idle, and retarded my timing a bit. My timing has been fully advanced for awhile cause if a vacuume leak. First time it's be tuned this good for awhile haha.