SOHC.co.uk Forums > CB350/400

Leaky carbs

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florence:
I think modern petrol is causing problems.  My CB350 has brass floats, one of them developed a hole, it was tiny but when I pressed the area the whole thing fell to bits on one side.  Also, I had a float bowl holed and float bowl tube split.  All on the same bike, which is why I have put on some AMALs I had lying around.  Back when I rode the bike, the original carbs were always temperamental, sticking diaphragm/sliders, so will be interesting to see what it is like with slide carbs.  Sorry, I'm digressing.
 

SeanFD:

--- Quote from: Nurse Julie on April 29, 2020, 10:21:45 AM ---I would start with float needle and seat and then put all floats in a bowl of water and make sure firstly they all float and secondly they all float at the same level.

--- End quote ---

Also try holding them under the water - like looking for a puncture - in case the hole/crack is at the top. When you take them out give them a shake and listen for fluid inside.

AndyD:
Again thanks everyone
Plenty of things to check when I get away from work today.
I didn't know that the floats were hollow on these so will check them in water.
Also will clean the float valves again just to be sure and the brass pipe for leaks

If all else fails are there any good / bad recommendations on repair parts - eBay has quite a few offering from around the world varying enormously in cost and contents.
On the GS1000s the strong recommendation was never use anything except original due to quality issues - is that the same fro these bikes?

Will update after the next round

Cheers,
Andy

H2Eric:
This problem sounds very familiar. If you have to replace the float needles and seats use genuine parts, others are pretty dire from my experience. As Julie says check that the floats float and they are all at the same level, mine didn't. I replaced the float needles and floats on my 350F and all is now tickety-boo and leak free. I had a similar problem with brass floats on an H2 which sank i.e. full of holes and full of petrol. Allens Performance came to the rescue with 3 new floats, problem solved and that was long before ethanol problems.

Cheers all

Eric

taysidedragon:
I bought rebuild kits from David Silver for mine and they work just fine. They are Keyster kits that sometimes get bad reports. Maybe there are fakes on the market so buy from a reputable dealer.  :)

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