Hitachi DCH340 carburetor

[Tommy Dat]

Good Day All,

I am rebuilding my Hitachi DCH340 from my '80 720 and I think that someone has already fiddled with it in the past. I don't know enough to tell if differences are modifications or just omissions. The carb on the left is the one I took off and started to rebuild. The carb on the right is a DCH340 that came off of my '77 200sx. The power piston on the right has a spring and my instructions for the rebuild show that spring. The carb on the left does not have that spring. I figured I would just scavenge the spring from the pic on the right but I cannot figure out how to remove the assembly?

Although both carbs have DCH340 engraved I can tell that there are some minor differences (maybe early/late models?) Do I need that spring for my rebuild on the left? what is the trick to remove it from the one on the right?

thanks

[Tommy Dat]

the pic did not post?  the URL box turns red once I submit.  I will keep at it, sorry

[Tommy Dat]

[Tommy Dat]

1 minute ago, Tommy Dat said:

I have circled in yellow the assembly that I am talking about, thanks for any help

[datzenmike]

It's just a plunger. The removable power valve is at the bottom back of the float chamber. Pretty sure that part circled is staked in place and not removable

[Tommy Dat]

thanks,  so I do not need to have a spring on it?  it does pump in and out like it may have an internal spring.

[datzenmike]

The spring is there for a reason so yes it needs it.

 

You might use a dremel to remove the staking holding the good one in place and get it out. When swapped to the '80 carb body you'll have to punch around it to displace metal to hold it in place.

 

Or...

 

Swap the carb bodies.

[None_zero]

[None_zero]

Just now, None_zero said:

Just saying....

[Thomas Perkins]

Hey Homie.Where in Georgia do you live?I am a few miles down the road from Columbus.

[datzenmike]

Follow the burn barrel smoke.

[720_Jeff]

34 minutes ago, datzenmike said:

Follow the burn barrel smoke.

Or, smoke from the Jacuzzi.  Just thought, he's probably using the burn barrel to heat the Jacuzzi.  Thrifty

 

[DwayneOxford]

On 12/11/2023 at 10:50 PM, datzenmike said:

It's just a plunger. The removable power valve is at the bottom back of the float chamber. Pretty sure that part circled is staked in place and not removable

You can depress it and let it snap up a few times and it'll come right out. Have to re-stake it then.