SOHC.co.uk Forums > CB350/400

Carbs off bike - Total disassembly or not?

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McCabe-Thiele (Ted):
IIRC the carbs bodies on a 400 are numbered to get them in the right order - that said you could probably get the bowls on the wrong side - as you say they should point outwards on either side.

Mikep328:
I've noticed that the choke lever, when moved to no-choke position will return slightly back due to the tension on the four choke butterfly springs.  It feels like there is a detent on the choke lever but the choke butterfly springs can pull the lever out of the detent.  Is there an adjustment for this?

Nurse Julie:

--- Quote from: Mikep328 on August 07, 2023, 06:27:12 PM ---I've noticed that the choke lever, when moved to no-choke position will return slightly back due to the tension on the four choke butterfly springs.  It feels like there is a detent on the choke lever but the choke butterfly springs can pull the lever out of the detent.  Is there an adjustment for this?

--- End quote ---
There should be a detent and a spring and a ball bearing to keep it in the closed position.

Mikep328:
If I disconnect the link arm to the choke butterflies and operate the lever I can feel/hear it "click" into the detent but when connected, the butterfly springs can pull it out of the detent position.  Maybe the detent spring has weakened after 47 years!  I'll disassemble that lever and take a look, maybe some sort of shim behind the spring will do the job!

McCabe-Thiele (Ted):
Sounds more like an issue with the fast idle cam adjustment on the choke as they are separate links.
The throttle opening and closing is independent of the choke mechanism except when the cam engages with the throttle.

I would be removing the carbs to check all the links for alignment then recheck the bench synch for the slider settings.

Are all the sliders nice and free throughout their travel?
Are the card bodies in the right order - can't see how they could be fitted together back to front but the bowls are clearly not the right way round

Be careful you do not loose the little ball in the detent if you dismantle the end part - they can get a tad rusty in that area.

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