Honda-SOHC
SOHC.co.uk Forums => CB350/400 => Topic started by: buxtonmick on August 11, 2013, 08:00:03 PM
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Just a quick one to confirm my thoughts....I fired up the 400/4 today at long last after complete renovation and engine rebuild, and amazingly it runs and idles really well but unfortunately while the fuel is turned on it also runs from all the carb 'overflow' tubes. Float heights wrong or needle valves stuck? Or any other problem as it flows from each of the tubes?
Thanks, Mick.
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give all the bowls a tap see if it free it mine stoped leaking when i did it
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Hi Mick- a common problem we have with them! I'm presuming that you have striped/cleaned and re-jetted with a whole kit? Mine does exactly the same now an then and as is said above, a sharp tap with a hammer once you have rushed to turn the fuel off usually unsticks the flat valves. I doubt its much more than that!
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usually stuck float needles or floats stiff on the pivot pins but I have seen float bowls with cracked overflow pipes
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Hi,
The only time I have had that happen is what Bryan said overflow tube split.
Cheers
Bitsa
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Thanks all, I tried tapping the bowls straight away without success :-\ As I say, what puzzles me is that all four tubes are running with fuel so I'm wondering if I've set the float heights incorrectly? It's such a long time ago now that I can't remember what I thought I'd set them at, I just followed that excellent carb strip and rebuild piece that Tim Boughen did...
Cheers, Mick.
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Doh! Took the carbs off for an inspection and found that some clown had rebuilt them and put the needle valves in upside down.... :-[ :-[
No 2 still putting fuel out of the tube though :'(