SOHC.co.uk Forums > CB750

750 f1 fuel leak

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Skoti:
Not sure what's causing this but when I park up in my garage for a couple of weeks or more and then pull the bike off the centre stand I get a few drips of petrol onto the garage floor from the carb overflow hoses.

Anyone had the same issue?


Carb float levels were set at 26mm about 4 years ago and not touched since.

I was maybe thinking about worn needle valves, but would this be a normal CB750 fault?
Bike has done 48,000 miles on originals.


regards

Skoti







 



 

Bryanj:
You should be turning the tap off when you park it

Skoti:
Forgot to mention the tap is turned off.

Bryanj:
That would suggest the tap is leaking through, could be bad washers under the screws holding it onto tank

hairygit:

--- Quote from: Bryanj on July 15, 2020, 07:37:05 AM ---That would suggest the tap is leaking through, could be bad washers under the screws holding it onto tank

--- End quote ---
The F1 tap is held on by the large gland nut Bryan rather than the internal screws of the pre K5 series of tanks. Sadly these taps when worn or getting old do leak past the tap packing, but it is not available as a spare. A new tap is the only real cure, and they are crazy expensive compared to the earlier K series taps

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