I have found a carb kicking around in my shed and I want to know what it is from and if it is any good. I got the carb with the coupes when I bough them. It was just in a box with some
other A12 carbs.
This carb looks similar to the standard A12 carb except it looks like it has some electronic stuff hanging off it. There is a black plastic cap at the back of the carb with a wire coming
out (automatic choke?), it also has a wire at the front of the carb.
I have no idea where the wires are suppost to go. There is also 3 pipes that look the same as the A12 vacuum pipe on the engine side of the carb. The jet sizes are 40 and what looks like
99 (its 99 if you read it the same way as you read the 40).
It lines up perfectly on the standard A12 manifold. The accelerator linkage is the same as the A12 carb but with some extra arms hanging of it. There is also a black pipe on the car body
side of the carb, which runs from the lower part of the carb to the top where it plugs into a disk shaped thing.
Sorry I cant be any more descriptive, the only other thing I can see it the Hitachi symbol on the carb.
I have bolted it on and got the car running but I have no choke as the cable and carb dont mate up. It also doesnt idle at all. I have tried playing with the idle screw but still no idle.
The carb is VERY responsive and revs up a lot quicker than the standard A12 carb.
But what is it and how can I get it to idle??

Cheers for any help, sorry this was a long message.

Simon

from your description of the carby, i'd have to say that all that extra gear is pollution gear.

and on saying that, i'd have to say that the carby would be off an A14 or A15. most likely an A14 coz the A15 carbies had smaller jets than the A12 carbies so i think
that might be it.

Justin

It sounds to me like you need to hook 12 volts (from the ignition switch) to those two wires. One is probably the electric choke as you suspected. The other is probably an anti-
dieseling solenoid. This cuts off fuel to the idle circuit when the ignition is off so the car won't run on. If it isn't energized, the car will run but not idle. Hope it helps!
Have a day. Tim

Sounds like it's probablt an A14. Think the others were right about the "idle solenoid". Standard practice for japanse engines to include one of these, particularly for more cammy
engines, to stop them dieseling. When power is supplied throught the wire, it pushes out a piston which moves the idle speed up (basically by holding the throttle slightly open). I've had
these on previous dattos and toyotas (some were vacuum operated but mostly electronic as it's easier).

Just chuck a spare +ve wire to it and see if it moves out, then set your idle off that. If it doesn't then it must be an auto choke and need a correct temperature unit to send the correct
voltage.

It sounds like someone's had one of the good 1400's at one time (the 80+ hp not the 60+ hp one).

Good for a mild or stock A12 motor, but can't cope with a worked A14 or A15. Nice find for back of the shed (I 'spose I can talk with the 240Z roundtops, the 350 Holley, the 65mm hitachi,
the motorbike carbies....).

Just as a point of information, here in the US 1200 carbs changed every year during the 1200's short life. The 71 had manual choke, 72 had auto choke with electric choke coil, 73 had
auto choke with electric choke coil and anti-dieseling solenoid. California cars might have further differences but I'm not familiar with those as I'm from the northeast. My 72 always
ran better in the winter with the 71 carb. I would leave the choke on just a tad. Otherwise it would hesitate.

Thanks for that info on carbs for each year but my standard 1972 carb had the anti-dieseling valve and I put in a choke cable and eliminated the automatic choke. Your hesitation was
the need for re-jetting. Stock jets in a carb are ones that the factory thinks will work in all conditions, they don't do that very well if you are in a wide temperature range. Timing
also. I personally, do not think that way. I try to put in the jets that are needed for the occasion and I time a motor as far advanced as possible and the motor still start.

I hope that everyone had a wonderful Christmas and that your new Year will be full of live and understanding.

Mareo

If you had the anti-dieseling solenoid I would guess your car was probably a late 72. Your absolutely right regarding the jetting. At the time I didn't have jets around to experiment
with so I advanced the timing a little, put a piece of cardboard in front of the radiator and used the manual choke carb with the choke on a bit. The results were ok.

Mareo, did you experience any cold weather hesitation with the stock carb before any modification? I used to complain to my Datsun dealer about the hesitation and they said no one else
had the problem , so I figured it was just something with my car.

I never had any hesitation in my 1200 until I put in Champion spark plugs. If you have Champion plugs take them out and use them for their only true purpose, throwing at rats.
1200 ownere, go out of your way to get NGK spark plugs. I have never had one problem with any NGK plug that I didn't cause myself. Try to get the V-groove plugs.

Mareo