SOHC.co.uk Forums > CB350/400
Leaky carbs
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. :)
AndyD:
Thanks again,
Had another go at the carbs this afternoon
Floats all float and evenly so I think they are OK
Bowls don't leak so guess the brass pipe is OK
Cleaned float valves again (shiniest part of the bike now!)
Checked float heights again
Put back on test and after a few seconds two carbs have a happy trickle from the overflows.
Turning the fuel supply off and then back on again the trickle doesn't reappear, only a drop forming on the overflow pipe.
I'm pretty sure it's worn float valves so I'll order up some replacements and see if that sorts it.
While waiting I might start on a CB900FD I finally hauled out of the shed on a sunny day last week - mind you it's a lot heavier than the 400, especially with seized brakes!!
Cheers,
Andy
SteveD CB500K0:
FZ.
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