I’m finishing up my carb rebuild for the Subaru justy. It went well but the secondary throttle opening angle has me confused. The manual says the secondary throttle plate should start to open when the primary throttle is opened to .236 or 43 degrees. Right now the secondary doesn’t start to open u…

I’ve worked on a lot of Hitachi carbs back in the 80s (Subaru and Nissan) but can’t say that I remember ever laying hands on a Justy carburetor. My memory is VERY hazy on this so don’t take anything I say as the Gospel truth. Have you tried checking throttle plate operation with the choke flap full…

The choke linkage connects to the primary throttle valve for the fast idle setting, I believe I got that part set up right. I wish I would have bought a weber carb instead of a rebuilt Hitachi, but I was trying to keep everything stock. Since I don’t think I can replace the duty solenoid in the Hit…

Back in the day I put a Weber kit (plus cam, headers etc.) on my '81 Accord. Great way to go if emissions tests aren’t strict. I would just take it out and see how it drives. If the secondary is opening late it will seem to flatten at wide open throttle as rpm’s climb. If you’re satisfied with t…

No alterations as far as I can tell. It’s never had much throttle response above 50mph but it’s only a 1.2 liter. Maybe the secondary plate bent itself down over the last 27 years. I don’t know much about carburetors, but I feel like the secondary should open more than .01" at full throttle. Then…

Is the vacuum diaphragm good? They age and crack.

Do you know an old hand that might take a look at your carb? Nothing beats having it in my hands to figure out what’s going on.

Without carb in hand I can’t tell you what the issue is. If all else fails do as texases suggested; find an old timer to take a look at it. In spite of the frustration I think you will find that the cause is going to be something very simple that is being overlooked. Maybe someone in a local old c…

I think my main problem was the accelerator pump diaphragm was torn, and the fast idle setting was way off. I was just thinking it might perform better if I got the secondary adjusted properly. Maybe I will just leave it alone for now and not risk making it worse. I brought it to a couple shops an…

The Subaru Justy is a rebadged Suzuki it seems and the secondary is controlled by vacuum. The primary linkage blocks the secondary from opening until the throttle is opened significantly.

Advice needed setting up Hitachi Carburetor

Maintenance/Repairs

Rod-Knox March 1, 2016, 7:24pm 4

Was there any alteration in the relative position of the secondary linkage? If not install the carburetor and start the engine. If it runs OK take it out on the road. It may be that the translation of the factory’s specs was less than perfect. I had an old Subaru shop manual that read like a third grader wrote it.

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Advice needed setting up Hitachi Carburetor

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