SOHC.co.uk Forums > CB350/400
Help !!! - Carb advice please
Trigger:
--- Quote from: Nurse Julie on January 15, 2015, 05:42:47 PM ---Thanks Graham. Now all I need now is an ultrasonic cleaner. I don't suppose an industrial steralizing autoclave in the Operating Theatre would do the job?, may have to sneak my carbs in with the operating instruments when no one is looking ;D ;D ;D
--- End quote ---
Be very careful on what fluid is in the bath. Had someone drop some float bowls in caustic soda once. The caustic eats the alloy so, nothing was left apart from the brass tubes.
Clem2112:
I bought a small u-sonic bath at Maplins for £40 odd a while back.
Not a mega investment for a useful tool.
Big enough for one carb body at a time. Took everything off the carb bodies first.
Only used Sea Clean fluid and warm water for 20 mins and got good results.
I Blew out all the passages and holes with compressed air afterwards then dried in the oven at a very low temp.
Some of the surfaces had lost their passivated finish so looked very matt grey, other parts looked as new after their deep cleansing.
martin_uk:
Its the very small passages (drillings) that tend to block up with corrosion/ fuel residue.
An ultrasonic cleaner creates a high frequency vibration that help break this down.
Make sure you look at schematic diagram so you know which channels go where and what they do.
The carbs will need syncronising to get operating in balance with each other and the idle mixture will need to be adjusted.
I use a x10 magnifier to closely examine jets and needles.
Always good to start checking jets and needles against original spec as often PO's have changed hoping to improve performance.
It is quite a tricky job, especially with 4 carbs.
Have a look at this https://www.youtube.com/watch?v=A-n2_3re7F8
Do lots of research as it should help you decide best approach
martin_uk:
[urlhttps://www.youtube.com/watch?v=dD3UWtLfzX4][/url]
Didnt watch all, but the removal of float hinge pin made me shudder as I would not hit that hard, plus the bit where he used side cutters to remove pin and says make sure you dont bend and bends :)
Be very very careful with the pillars that hold these pins as very easy to break. :-[
Best advice is watch loads and see best techniques.
Nurse Julie:
Well, I did give the pins quite a tap to remove them earlier !!!!. 3 came quite loose so easy to grip and pull with pliers but the 4th needed a bit of persuasion. Sprayed with WD40 and had 2 cuppas, tapped it on the end with the flat end of a split pin and hey presto, it shot across the room. All look straight though which is handy. Will watch that Video to learn alot more than I already know, which is a nano over nothing ;D ;D ;D
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