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CB350F vs CB400F Carbs

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gerben:
Hi Ashley,

I understand your concerns about the difference between CB350 and CB400 carbs. The only difference is the size of the main jets.
You just have to change them for the correct size and try the set on your engine.  For the CB350 it says to set the air screws on 1 7/8 turns instead of 2 turns for the CB400.
The final tuning has tobe done using a vacume set (4) to synchronise the 4 carbs.
Just try this.
I have never heard any issues about changing the main jets and after wards problems occurred.

Regards   Gerben

AshimotoK0:

--- Quote from: gerben on August 07, 2020, 11:37:24 AM ---Hi Ashley,

I understand your concerns about the difference between CB350 and CB400 carbs. The only difference is the size of the main jets.
You just have to change them for the correct size and try the set on your engine.  For the CB350 it says to set the air screws on 1 7/8 turns instead of 2 turns for the CB400.
The final tuning has tobe done using a vacume set (4) to synchronise the 4 carbs.
Just try this.
I have never heard any issues about changing the main jets and after wards problems occurred.

Regards   Gerben

--- End quote ---

Thanks Gerben .. I understood from the Honda manuals that both models had the same main jet size of  #75  but the 350 has a smaller slow running jet. Size of 38 as opposed to #40 on the 400F.  ... does anyone know the 'standard'needle clip position on the 350?

royhall:
Did I say slow running jets, you know I meant main jets. Senior moment.

AshimotoK0:

--- Quote from: royhall on August 07, 2020, 03:25:32 PM ---Did I say slow running jets, you know I meant main jets. Senior moment.

--- End quote ---

No I think you are right Roy if you go by the manuals it's the slow running jets you need to change, the main jets are supposed to be the same. Evidently, according to a guy who's really  into his 350 fours & CB92's the castings are the same but drilled differently. I am going to give them a whirl on my mates 400/4 tomorrow that he's just rebuilt.

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