SOHC.co.uk Forums > CB350/400
Carb work
Nurse Julie:
You could try penetrating oil but experience has taught me that how ever careful you are removing the screws, its when you put them back in the problem occurs. You jut get that very 'loose' feeling on the end of the screwdriver but by then its too late. Remove the screw and the thread comes out with it :'(
mattsz:
--- Quote from: Nurse Julie on January 18, 2019, 03:35:05 PM ---You could try penetrating oil but experience has taught me that how ever careful you are removing the screws, its when you put them back in the problem occurs. You jut get that very 'loose' feeling on the end of the screwdriver but by then its too late. Remove the screw and the thread comes out with it :'(
--- End quote ---
Ah, ok... I wondered if it was an initial "removal" problem, where the screws simply bring the threads with them...
Nurse Julie:
The removal of the screw is ok as you have the leaf spring pushing the bowl down, so there is little or no tension on the screw thread. When you re fit the bowls, you are having to push against the leaf spring, whilst trying to do the screws up. I always put 2 screws in at opposite corners of the bowl and just nip them up to take out some of the tension and then pop the other two screws in.
andut:
I'd recommend that you try using the original needle valves. Just give the needles and the seats a bit of a polish and replace all of the o rings and then take some time to make sure that you get the float heights correct.
Whilst you're in there, it's also worth checking that the jet sizes are std to get an idea if someone has been in there before you in which case you might want to think about checking needle heights.
Also check that both jets and the emulsion tubes are clear - make sure you check the cross drillings in the idle jets and the emulsion tubes.
The choke flaps are simple to adjust to make sure that they're all fully open.
And as Julie mentioned, buy yourself a helicoil kit for the float bowl screws
mattsz:
Thanks guys!
Is there a specific resource which would show me specifically, on these carbs, what parts are what and where they go... the jets and float valve and such I know about, but what about the different passages? I'm looking to dismantle the carbs enough to replace the rubber bits and clean everything as best I can, but without separating them, which means carb cleaning spray and compressed air. And probably some degreaser for the exteriors...
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