Hi everyone,

I have a 1200 wagen recenly bought (HB 310 - 1400 GL Converted to 1200 A12 Petrol Engine)

I wanted to know carburetor jet sizes to repair it.Now it has wrong size jets
This is a Hitachi single carb model ( I cannot find exact carb model)

please help me

We know the jet sizes for the HB310 with A14 engine.

But we don't know which A12 engine you have.

Look here for an inked model number. Because it is ink, if the carburetor was cleaned too much if may have disappeared.

thanks for your quick reply

I think this is not my one. tomorrow i will post some pics of carb and engine

Here is some pics of engine and carburetor
i cannot find any part no on carburetor only found engine no

Attach file:

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  carb1.JPG (75.85 KB)


  carb2.JPG (72.30 KB)


  engine.JPG (93.85 KB)


  carb3.JPG (76.81 KB)


  carb4.JPG (75.43 KB)

Carburetor number is right here:

Attach file:

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  carb_ID.jpg (39.11 KB)

Yes you are right It cleaned too much by early owners that is why i cannot found any part no

No worries, it is Hitachi DCH-306. "H" means automatic choke.

Without the ID number, we cannot say what jets it originally came with.

But suitable jets can be determined. We need to know the venturi sizes of your carburetor. They are the cast numbers, viewable by looking down into the carburetor, something like 20/26:

Hi ,

Its 22 / 27

I think somebody who replaced the engine without changing Carburetor

You can see 27 secondary size in carb2.jpg

That's OK. I run an A15 carburetor on my A12, and it works pretty good, a little lean but returns very good fuel economy.

So it looks like an A14 carburetor.

There were dozens for carburetors for A14, all with different jetting. All run pretty good. I would use the jets listed in the Carburetor Specifications article for Australia A14, which is a conservative and perhaps most universal jetting.