Original rd400 carb assembly

[rd400greenhorn]

Hi guys

Is this right - that half moon, does it sit correct direction?

[Alain2]

Correct. Are those 284 nozzle?

[rd400greenhorn]

284 nozzle? Not sure 

[Yamaha 179]

That's the correct direction but, if the carb is stock, it is not the correct Needle Jet (Nozzle).  Have the carbs been modified?  That is a primary Needle Jet and the 400s come stock with the bleed style jet.
Lyn Garland

[rd400greenhorn]

Ah okay!
Can it run with anyways?

Its a mix match of carb parts, did not notice. They are both gonna run oil injektion

[rd400greenhorn]

I have maybe 10 sets of carbs and some were modified. Might have been from that

[Alain2]

You need to check what nozzles they are, they might not be adequate for your setup.

[rd400greenhorn]

So i assume i need to change that nozzle to a stock as the carb w. Choke?

[Alain2]

You need to check the numbers stamped on both nozzles to figure out what you have first.

[rd400greenhorn]

Yeah so there was only one in, the other carb had 'stock' setup..

I might think they miss some stuff so both carbs are off.

What about the tube, as you see in this picture, one carb has it and one dont

[SoCal250]

You have two left side (choke side) float bowls in the photo above.

Original needle jets should be 175 series. Whatever type you use -- bleed type or primary type -- they should be the same in both carbs.

One carb will have the brass tube and one doesn't. That's normal since you have the choke on one side.

[rd400greenhorn]

Got cha. Thanks man.
Never messed with original carbs so these info are valuable. I Will get that sorted