SOHC.co.uk Forums > CB350/400

Carb work

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Rob62:
Regarding the float bowl screws, sure use penetratong oil if they have been stood a while, but if you’ve already removed them once its too late for that. Make sure the screws are clean and if they look shot (threads or screw heads) replace them... Most importantly when you refit them just give them a gentle nip and avold overtightening. You could use a bit of copper grease on the threas to prevent any further damage but shouldn’t be necessary if you don’t overtightening. Good luck 😄

mattsz:
I opened up the rest of the bowls today, no issues.  All screws were only just barely more than "finger tight."  I had a moment of panic when I removed one of the carb top covers, and felt the screw dragging and grinding a bit, but it turned out to be the split washer turning with the screw and scraping the top of the alloy cover.

All four bowl interiors looked about the same - dirty, but dry and powdery, not sticky or varnish-y.  Two of the float pins were a bit bunged up, though, and gave me a bit of trouble - one had been gripped with pliers at some point, and had some tooth gouges, which I polished out enough to be able to reinsert it easily.  The second had one end that was slightly bent, and so it didn't want to budge. But I freed it up and tried to straighten it out a bit, not sure if I really improved it, anyway it goes back in enough and I can remove it again.  Either way, all four floats pivot with no restriction.

All four have a 75 main jet, and a 40 pilot (slow?) jet, per spec.  Are there any other numbered items I should be on the lookout for?  The Honda Service Manual quotes a spec of "Carburetor Setting mark: 054-A".  I can't find any other reference to that.

It seems like most of the "tutorials" for carb disassembly include disconnecting them, which I was thinking of not doing initially.  I'm having a hard time deciphering what steps are for separating the carbs, and what steps are just for dismantling interior parts for cleaning, especially for the upper parts (everything in the float bowl is obvious).  Anyone have any suggestions for where I might go for clarification?  Are there multiple grooves in the needle?

taysidedragon:
If you don't split the carbs you can still remove the throttle slides with the needles attached to them. The needle has several grooves. If I remember correctly the standard position is 3rd groove down for the circlip. It's clearly shown in Clymer or Haynes manual.

mattsz:

--- Quote from: taysidedragon on January 20, 2019, 01:27:10 AM ---If you don't split the carbs you can still remove the throttle slides with the needles attached to them. The needle has several grooves. If I remember correctly the standard position is 3rd groove down for the circlip. It's clearly shown in Clymer or Haynes manual.

--- End quote ---

I have both.  Interesting that the Honda service manual doesn't mention the needle grooves...

Clem2112:
Honda didnt want anyone messing with the mix !

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